ON Semiconductor ST6391, ST6392, ST6393, ST6395, ST6397 Technical data

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ST6391, ST6392, ST6393 ST6395, ST6397, ST6399

DATA SHEET

USE INLIFE SUPPORTDEVICES OR SYSTEMS MUSTBE EXPRESSLYAUTHORIZED.

SGS-THOMSON PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS INLIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESSWRITTEN APPROVAL OF SGS-THOMSON Microelectronics. As used herein :

1. Life support devices or systems are those which (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided with the product, can be reasonably expected to result in significant injury to the user.

2. A criticalcomponent is any component of alife support device or system whose failure to perform can reasonably be expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.

ST639x DATASHEET INDEX

ST6391, ST6392, ST6393

Pages

ST6395, ST6397, ST6399

GENERAL DESCRIPTION . . . . . . . . . . . . .......................... 3

PINDESCRIPTION ......................................... 5

ST639x CORE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

MEMORYSPACES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

INTERRUPT . . . .......................................... 17

RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

WAIT& STOPMODES . . . . . . . . . . . . . . . . ....................... 23

ON-CHIPCLOCK OSCILLATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

INPUT/OUTPUT PORTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

TIMERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

HARDWARE ACTIVATEDDIGITAL WATCHDOG FUNCTION . . . . . . ............. 31

SERIALPERIPHERALINTERFACE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

6-BITPWMD/A CONVERTERS . . . . . . . . . . . . . . . . ................... 41

AFC A/DCOMPARATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

DEDICATED LATCHES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...... 42

ON-SCREENDISPLAY(OSD) . . . . . ............................... 43

SOFTWARE DESCRIPTION. . . . . ................................ 52

ABSOLUTEMAXIMUMRATINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

PACKAGEMECHANICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

ORDERINGINFORMATION TABLE . . . . . . . . . . . . . . . . . . . . . ............ 64

............................... 1



ST6391, ST6392, ST6393



FOR TV FREQUENCY SYNTHESIS WITH OSD

4.5 to6V supply operatingrange 8MHzMaximum Clock Frequency

UserProgram ROM: Upto 20140 bytes Reserved Test ROM:Up to 340 bytes Data ROM: User selectable size Data RAM: 256 bytes Data EEPROM: Up to 384 bytes

42-PinShrink Dual inLine Plastic Package Up to 23 software programmable general pur-

pose Inputs/Outputs, including 2 direct LED driving Outputs

Two Timerseach includingan 8-bit counter with a 7-bitprogrammable prescaler

Digital WatchdogFunction

ST6395, ST6397, ST6399

8-BIT HCMOS MCUs

PRELIMINARY DATA

PSDIP42

(Ordering Information at the end of the datasheet)

Serial Peripheral Interface(SPI)supporting S-BUS/I

C BUSand standardserial protocols SPIfor externalfrequency synthesistuning Up to Six 6-Bit PWMD/A Converters AFCA/D converterwith 0.5V resolution Five interrupt vectors (IRIN/NMI, Timer 1 & 2,

VSYNC,PWR INT.) On-chipclock oscillator 5 Lines by 15 Characters On-ScreenDisplay

Generatorwith 128 Characters All ROM types are supported by pin-to-pin

EPROMand OTP versions. The development tool of the ST639x microcon-

trollers consists of the ST638x-EMUemulation and development system to be connectedvia a standard RS232 serial line to an MS-DOSPersonal Computer.

DEVICE SUMMARY

DEVICE

ST6391 16K 128

ST6392 20K 128

ST6393 16K 128

ST6395 20K 384

ST6397 20K 384

ST6399 16K 128

ROM

(Bytes)

EEPROM

(Bytes)

October 1993

This isPreliminaryinformation from SGS-THOMSON. Details are subjectto change withoutnotice.

1/64

ST6391,92,93,95,97,99

Figure1. ST6393/97 Pin Configuration

DA0

DA1

DA2 DA3

DA4 DA5

PB1

PB2 AFC PB4 PB5 PB6 PA0

PA1

PA2 PA3 PA4 PA5 PA6 PA7

Figure2. ST6392/99 Pin Configuration

12 13 14 15 16 17 18 19

1 2

3 4

6 7

8 9

20 21

PC0 (SCL)

PC1 (SDA)40

PC2

PC3 (SEN)

38 37

PC4

PC5

PC6 (IRIN)

PC7

RESET

33 32

OSCout

OSCin TEST

OSDOSCout OSDOSCin

VSYNC

HSYNC

BLANK B

24 23

VA00339

Figure3. ST6391/95 PinConfiguration

DA0 DA1

DA2 DA3 4

62.5kHz OUT PB0

PB1

PB2 PB3 PB4 PB5 PB6 PA0

PA1 PA2 PA3 PA4

PA5

PA6 (HD0) PA7 (HD1)

10 11 12

13 14 15 16 17 18 19

20 21

1 2

6 7

8 9

PC0 (SCL)

PC1 (SDA)

PC2

PC3 (SEN)

38 37

PC4 (PWRIN)

PC5

PC6 (IRIN)

3435PC7

RESET

33 32

OSCout OSCin

TEST

30 29

OSDOSCout OSDOSCin

28 27

VSYNC

HSYNC

BLANK B

24 23

VA00340

Note 1.ST6395 only

DA0

DA1

DA2 DA3 4

PB0

PB1

PB2

PB3 PB4 PB5

PB6 PA0

PA1 PA2 PA3 PA4

PA5

PA6 (HD0) PA7 (HD1)

1 2 3

5DA4

6 7

9 10 11 12 13 14 15

17 18 19

42 41

PC0 (SCL)

PC1 (SDA)40

PC2

PC3 (SEN)

38 37

PC4 (PWRIN )

PC5

PC6 (IRIN)

3435PC7

RESET

OSCout

OSCin

TEST

30 29

OSDOSCout OSDOSCin

28 27

VSYNC

HSYNC

BLANK

23 22

(1)

VA00337

2/64



GENERAL DESCRIPTION

The ST639xmicrocontrollersaremembersof the 8bit HCMOS ST638xfamily,a seriesof devicesspeciallyorientedto TVapplications.DifferentROMsize and peripheral configurationsare available to give the maximum application and cost flexibility. All ST639xmembersare basedon a building blockapproach:a commoncoreissurroundedbya combination of on-chip peripherals (macrocells) available from a standardlibrary. These peripheralsare designedwith the same Coretechnologyprovidingfull compatibility and short design time. Many of these macrocells are specially dedicated to TV applications.The macrocellsof the ST639xfamily are:two Timer peripherals each including an 8-bit counter with a 7-bit software programmable prescaler

ST6391,92,93,95,97,99

(Timer), a digital hardware activated watchdog function(DHWD), a 14-bitvoltage synthesis tuning peripheral, a Serial Peripheral Interface (SPI), up to six 6-bit PWMD/A converters,an AFC A/D converter with 0.5V resolution, an on-screen display (OSD)with 15charactersper line and 128 characters (in two banks each of64 characters).In addition the followingmemory resourcesare available: programROM (up to 20K), data RAM (256 bytes), EEPROM(up to 384 bytes).Refer to pin configurations figures and to ST639x device summary (Table 1) for the definition of ST639x family members and a summaryof differencesamong the different types.

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

ST6391,92,93,95,97,99

Figure4. ST6391,92,93,95,97,99Block Diagram

* Refer To Pin Configuration For Additional Information

TEST

IRIN/PC6

TEST

IR INTERRUPT

Input

DATA ROM

USER PROGRAM

ROM

UP TO 20 kBytes

USER SELECTABLE

DATA RAM

256 Bytes

DATA EEPROM

384 Bytes

STACK LEVEL 1 STACK LEVEL 2 STACK LEVEL 3 STACK LEVEL 4 STACK LEVEL 5 STACK LEVEL 6

8-BIT CORE

POWER SUPPLY OSCILLATOR RESET

OSCin OSCout

RESET

PORT A

PORT B

PORT C

SERIAL PERIPHERAL

INTERFACE

TIMER 1

TIMER 2

DIGITAL

WATCHDOG/TIMER

D/AOutputs

AFC Input

ON-SCREEN

DISPLAY

PA0 - PA7 *

PB0 - PB7 * PC2, PC4 - PC7 *

PC0 / SCL PC1 / SDA PC3 / SEN

DA0 - DA5

AFC

R, G, B, BLANK HSYNC, VSYNC

VR01753G

Table 1. Device Summary

DEVICE

ST6391 16K 256 128 NO 5 3 NO NO 62.5 NO ST63E91

ST6392 20K 256 128 NO 4 3 YES YES 62.5 YES ST63E92

ST6393 16K 256 128 YES 6 3 NO NO 62.5 NO ST63E93

ST6395 20K 256 384 NO 5 3 NO YES 100 NO ST63E95

ST6397 20K 256 384 YES 6 3 NO NO 100 NO ST63E97

ST6399 16K 256 128 NO 4 3 YES YES 62.5 YES ST63E99

ROM

(Bytes)

RAM

(Bytes)

EEPROM

(Bytes)

AFC D/A

COLOUR

PINS

LOW

POWER IN

RESET

PWRIN

4/64



SPI

CLK FREQ.

(kHz)

62.5kHz Pin

EMULATING

DEVICES

PIN DESCRIPTION V

andVSS. Power issupplied to the MCU using

these twopins. V

ispower and VSSistheground

connection. OSCin, OSCout. These pins are internally con-

nected to the on-chip oscillator circuit. A quartz crystal or a ceramic resonator can be connected between these two pins in order to allow the correct operation of the MCU with various stability/cost trade-offs. The OSCin pin is the input pin, the OSCoutpin is the output pin.

RESET. The activelow RESET pin is used to start the microcontrollerto the beginning ofits program. Additionally the quartz crystal oscillator will be disabled when theRESET pin islow to reduce power consumptionduringresetphase (ST6392/99only).

TEST. The TESTpin must be held at V

for nor-

mal operation. PA0-PA7. These 8 linesare organizedas one I/O

port (A). Eachline may be configuredas either an input withor withoutpull-upresistor oras an output under softwarecontrol of the datadirectionregister. PinsPA4 toPA7 are configured as open-drain outputs (12V drive). On PA4-PA7 pins the input pull-up option is not available while PA6 and PA7 have additional current driving capability (25mA,

:1V).PA0 to PA3pins areconfiguredas push-

pull. PB0-PB2, PB4-PB6. These 6 linesare organized

as one I/O port (B).Each line may be configuredas either aninput withorwithoutinternalpull-up resistor or as an output under software control of the data directionregister.

PC0-PC7. These 8 linesare organizedas one I/O port (C). Each line may be configured as either an input with or without internal pull-up resistor or as an output under software control of the data direction register. Pins PC0 to PC3 are configured as open-drain(5V drive)in output mode while PC4 to PC7 are open-drain with 12V drive and the input pull-up options doesnotexist on thesefour pins.

PC0, PC1 and PC3 lines when in output mode are “ANDed” with the SPI control signals and are all

ST6391,92,93,95,97,99

Open-drain.PC0is connectedtothe SPI clock signal (SCL), PC1 with the SPI data signal (SDA) while PC3 is connected with SPI enable signal (SEN, used inS-BUS protocol).Pin PC4 and PC6 can also be inputstosoftwareprogrammableedge sensitive latches which can generate interrupts; PC4 can be connected to Power Interrupt while PC6 can be connected to the IRIN/NMI interrupt line.

DA0-DA5. These pins are the six PWM D/A outputs of the 6-bit on-chip D/A converters. These lines have open-drain outputs with 12V drive. The output repetition rate is 31.25KHz (with 8MHz clock).

AFC.This is the input ofthe on-chip 10 levels comparator that can be used to implement the AFC function. This pin is an high impedance input able to withstand signals with a peak amplitude up to 12V.

OSDOSCin, OSDOSCout. These are the On Screen Display oscillator terminals. An oscillation capacitorand coil network have tobeconnected to provide theright signal to theOSD.

HSYNC, VSYNC. These are the horizontal and vertical synchronizationpins. The activepolarity of these pins to the OSD macrocell can be selected by the user as ROM mask option. If the device is specified to have negative logic inputs, then these signals are lowthe OSD oscillator stops. If the device is specifiedto have positivelogic inputs,then when these signals are high the OSD oscillator stops.

R, G, B, BLANK. Outputsfrom the OSD. R, G and B are thecolor outputs while BLANK is the blanking output.All outputsare push-pull. The activepolarity of these pins can be selected by the user as ROM mask option.

62.5kHz OUT. This pin is available only on the ST6392/99. The pin isan open drain (12V) output at the frequencyof 62.5kHz (with an 8MHz clock). The pin can be used to drive the SGS-THOMSON TEA5640 Chroma Processor. Refer to the TEA5640 Data sheetfor more information.

5/64



ST6391,92,93,95,97,99

Table 2. Pin Summary

Pin Function Description

DA0 to DA5 Output, Open-Drain, 12V AFC Input, High Impedance, 12V R,G,B, BLANK Output, Push-Pull HSYNC, VSYNC Input, Pull-up, Schmitt Trigger OSDOSCin Input, High Impedance OSDOSCout Output, Push-Pull TEST Input, Pull-Down OSCin Input, Resistive Bias, Schmitt Trigger to Reset Logic Only OSCout Output, Push-Pull RESET Input,Pull-up, Schmitt Trigger Input PA0-PA3 I/O, Push-Pull, Software Input Pull-up, Schmitt Trigger Input PA4-PA5 I/O, Open-Drain, 12V,No Input Pull-up, Schmitt Trigger Input PA6-PA7 I/O, Open-Drain, 12V,No Input Pull-up, Schmitt Trigger Input, High Drive PB0-PB6 I/O, Push-Pull, Software Input Pull-up, Schmitt Trigger Input PC0-PC3 I/O, Open-Drain,5V , Software Input Pull-up, Schmitt Trigger Input PC4-PC7 I/O, Open-Drain,12V, No Input Pull-up, Schmitt Trigger Input V

DD,VSS

Power Supply Pins

62.5kHz OUT Output, Open-Drain 12V

6/64



ST6391,92,93,95,97,99

ST639x CORE

TheCoreoftheST639xFamilyisimplementedindependently from the I/O or memory configuration. Consequently,it can be treated as an independent centralprocessorcommunicatingwithI/Oandmemoryvia internaladdresses,data,andcontrolbusses. The in-core communication is arrangedas shown in the followingblock diagram figure; the controller being externallylinkedto both thereset and the oscillator, while the core is linked to thededicatedonchip macrocells peripherals via the serial data bus and indirectly for interrupt purposes through the control registers.

Registers

The ST639x Family Core has five registers and three pairs of flags available to the programmer. They are shown in Figure 5 and are explained in the following paragraphs together with the program and data memorypage registers.

Accumulator(A). Theaccumulatorisan 8-bitgeneral purpose registerused in allarithmetic calculations, logical operations, and data manipulations. Theaccumulatoris addressedin thedataspaceas RAMlocationat theFFhaddress. Accordingly, the ST639x instruction set can use the accumulator as any other register of the data space.

Figure6. ST639x Core Programming Model

INDEX

PROGRAMCOUNTER

NORMAL FLAGS

INTERRUPT FLAGS

NMI FLAGS

X REG.POINTER

Y REG.POINTER

V REGISTER

b7 b7

W REGISTER

ACCUMULATOR

SIX LEVELS

STACKREGISTER

SHORT DIRECT

ADDRESSING

MODE

b0 b0

b0b11

VA000423

Figure5. ST639x Core Block Diagram

7/64



ST6391,92,93,95,97,99

ST639x CORE (Continued) Indirect Registers (X, Y). These two indirect reg-

istersare usedas pointers tothe memorylocations in the dataspace. They are usedin theregister-indirect addressing mode.These registers can be addressed in the data space as RAM locations at the 80h (X)and 81h (Y)addresses.They can also be accessed with the direct, short direct, or bit direct addressing modes. Accordingly, the ST639x instructionsetcan use the indirect registers as any other registerof the data space.

Short Direct Registers (V, W). These two registers are used to save one byte in short direct addressing mode.These registerscan be addressed in the data space as RAM locations atthe 82h (V) and 83h (W) addresses. They can also be accessed with the direct and bit direct addressing modes. Accordingly, the ST639x instruction set can use the shortdirect registers as any other register ofthe data space.

Program Counter (PC)

Theprogramcounterisa12-bitregisterthatcontains the address of the next ROM location to be processed bythecore.ThisROMlocationmaybe anopcode, an operand, or an address of operand. The 12-bit length allows the direct addressing of 4096 bytesin theprogramspace.Nevertheless,iftheprogramspacecontainsmorethan4096 locations,the further programspace can be addressed by using the ProgramROM Page Register. The PC value is incremented, after it is read for the address of the currentinstruction,bysendingitthroughtheALU,so giving the address of the next bytein the program. Toexecuterelative jumpsthe PC and the offsetvaluesare shiftedthroughtheALU, where they will be added,andtheresultisshiftedbackintothePC.The program counter can be changed in the following ways:

JP (Jump)instruction....PC=Jump address

CALL instruction...........PC=Call address

Relative Branch

instructions...................PC=PC+offset

Interrupt........................PC=Interruptvector

Reset............................PC=Resetvector

RET &RETI instructions............PC=Pop (stack)

Normal instruction........PC=PC+1

Flags (C, Z)

The ST639x Core includesthree pairsof flags that correspond to 3 differentmodes: normalmode,interrupt mode and Non-Maskable-Interrupt-Mode. Each pair consistsof a CARRY flag and a ZERO flag. One pair (CN, ZN) is used duringnormal operation, one pair is used during the interruptmode (CI,ZI)andone is usedduring thenot-maskableinterruptmode (CNMI, ZNMI).

The ST639x Cor e uses the pair of flags that correspondsto the actual mode: as soon as an inter rupt (resp. a Non-M as kable-Interrupt) is generated, the ST639xCoreusesthe interrupt flags(resp. the NMI flags)insteadof the normalflags. When theRETI instruc ti onisexecuted,thenormalflags(re sp.the interruptflags)arerestoredif theMCUwasin the normal mode(res p.intheinterr uptmode)beforetheinterr upt. Shouldbeobservedthateachflagsetcanonly be addressed in its own routine (Not-maskable interrupt, normal interrupt or main routine). The interrupt flags arenot cleared during the context switching and so, theyremain in thestate they wereatthe exitof the last routineswit ching.

The Carry flag is set when a carry or a borrow occurs during arithmetic operations, otherwise it is cleared. The Carry flag is also set to the value of the bit tested in a bit test instruction, and participates in the rotate left instruction.

TheZeroflagissetif theresultofthelastarithmetic or logical operation wasequal to zero, otherwise it is cleared.

The switching between these three sets is automaticallyperformedwhen anNMI,an interrupt and a RETI instructions occur. As the NMI mode is automatically selected after the reset ofthe MCU, the ST639xCore uses atfirst the NMI flags.

Figure7. Stack Operation

PROGRAM COUNTER

WHEN

RET OR RETI

OCCURS

STACK LEVEL 1 STACK LEVEL 2 STACK LEVEL 3 STACK LEVEL 4 STACK LEVEL 5 STACK LEVEL 6

WHEN CALL

INTERRUPT REQUEST

OCCURS

VA000424

8/64



ST639x CORE (Continued) Stack

The ST639x Core includes true LIFO hardware stack that eliminatesthe need for a stack pointer. The stackconsists of six separate 12-bit RAM locations that do notbelong to the data space RAM area. When a subroutine call (or interruptrequest) occurs,the contentsofeachlevelis shiftedinto the next levelwhile the contentofthe PC is shiftedinto the first level (the value of the sixth level will be lost). When subroutine or interrupt return occurs (RET or RETI instructions),thefirst level registeris shifted back into the PCand thevalue of eachlevel is shifted back into the previous level. These two operating modes are describedin Figure 7. Since the accumulator,as all otherdata space registers, is notstored inthisstack the handlingof thisregisters shall be performed inside the subroutine. The stack pointer will remain in its deepest position,if more than 6 calls or interrupts are executed, so that the last return address will be lost. It will also remain in its highest position if the stack is empty and a RET or RETI is executed. In this case the next instructionwill be executed.

Memory Registers The PRPR can be addressed like a RAM location

in the Data Space at the CAh address; nevertheless it is a write-only register that can not be accessed with single-bit operations.This register is used to select the 2-Kbyte ROM bank of the Program Spacethat will be addressed.The number of the pagehastobe loaded inthePRPR.ThePRPR is not cleared during the MCU initialization and should thereforebe defined before jumpingout of the static page. Refer to the Program Space description for additional information concerning the use of this register. The PRPR is not modified when an interruptor a subroutine occurs.

Figure8. Program ROMPage Register

PRPR

Program ROMPage Register

(CAh, Write Only)

D7 D6 D5 D4 D3 D2 D1 D0

ST6391,92,93,95,97,99

The DRBR can be addressedlike a RAMlocation

in the Data Space at the E8h address, nevertheless it is write-only register that can not be accessed with single-bit operations. This register is used to select the desired 64-byteRAM/EEPROM bank of the Data Space. The numberof the bank has to be loaded inthe DRBR and the instruction has to point to the selected location as itwas inthe 0 bank (from 00h address to 3Fh address). This register is undefined afterReset. Refer to the Data Space description for additional information. The DRBRregisterisnot modifiedwhen a interruptor a subroutine occurs.

Figure9. Data RAM Bank Register

DRBR

Data RAM Bank Register

(E8h, Write Only)

D7 D6 D5 D4 D3 D2 D1 D0

TheDRWR registercanbeaddressedlike a RAMlocationin theDataSpaceat the C9haddress,nevertheless it is write-only register that can not be accessed with single-bit operations.This register is used to move up and down the 64-byte read-only datawindow (fromthe 40h addressto 7Fh address of the Data Space)along the ROM of the MCU by stepof 64 bytes.Theeffectiveaddressof thebyteto bereadasadata inthe ROMisobtainedby the concatenationofthe6lesssignificantbitsoftheaddress given in the instruction(as less significant bits)and the contentof the DRWR (as most significantbits). RefertotheDataSpacedescriptionforadditionalinformation.

Figure10. Data ROM Window Register

DRWR

Data ROM Window Register

(C9h, Write Only)

D7 D6 D5 D4 D3 D2 D1 D0

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

ST6391,92,93,95,97,99

MEMORY SPACES

The MCUs operate in three different memory spaces: Stack Space, Program Space, and Data Space. A descriptionof these spaces is shown in Figure 11.

Stack Space

Thestack spaceconsistsof six 12 bit registers that areusedfor stackingsubroutineandinterrupt return addressesplusthecurrentprogramcounterregister.

Program Space

The program space is physically implemented in the ROM and includes all the instructions that are to be executed, as well as the data requiredforthe immediate addressing mode instructions, the reserved test area and uservectors. It is addressed thanks to the 12-bit Program Counter register (PC register) and so, the ST639x Core can directlyaddress upto 4K bytesof Program Space.Nevertheless, the ProgramSpace can be extended by the addition of 2-KbyteROM banks as it is shown in Figure 13 in which a 20K bytes memory is described.Thesebanks areaddressed bypointing to the 000h-7FFh locations of the Program Space thanks to the Program Counter, andby writingthe appropriatecode in theProgram ROM Page Register (PRPR) located at the CAh address of the Data Space.Becauseinterruptsand common subroutines should be available all the time only the

lower 2K byte of the 4K program space are bank switched while the upper 2K byte can be seen as static space. Table 3 gives thedifferent codes that allows the selection of the corresponding banks. Note that,fromthe memory point of view,thePage 1 and the StaticPage represent the same physical memory:it isonly adifferentway ofaddressingthe same location. On the ST6392,95,97, a total of 2048, bytes of ROM have been implemented; 20140 areavailableas userROMwhile 340arereservedfor testing.

Figure12. ST639x 20K Bytes Program Space AddressingDescription

Program counter

space

0FFFh

0800h

07FFh

0000h

0000h 4FFFh

Static Page

Page 1

Page 0

Page 1

Static Page

Page 9

Figure11. ST639x Memory Addressing Description Diagram

STACK SPACE

0000h

PROGRAM COUNTER

STACK LEVEL1 STACK LEVEL2 STACK LEVEL3 STACK LEVEL4 STACK LEVEL5 STACK LEVEL6

07FFh 0800h

0FF0h

0FFFh

PROGRAM SPACE

ROM

INTERRUPT &

RESET VECTORS

0-63

000h

03Fh 040h

070h 080h

081h 082h 083h 084h

0C0h

0FFh

DATA SPACE

RAM / E EPROM

BANKING AREA

DATA ROM

WINDOW

X RE GISTER Y R EGISTER V RE GISTER

WREGISTER

RAM

DATA ROM

WINDOW SELECT

DATA RAM

BANK SELECT

ACCUMULATOR

VR001568

10/64



MEMORY SPACES(Continued) Figure13. Program ROM Page Register

PRPR

Program ROMPage Register

(CAh, Write Only)

D7 D6 D5 D4 D3 D2 D1 D0

PRPR0 PRPR1 PRPR2 PRPR3

UNUSED

ST6391,92,93,95,97,99

interrupt driver in a (minor) part in the static page (start and end), and in the second (major) part in one dynamicpage. If it is impossible to avoid the writing of this register in interrupts drivers, an image of this register must be saved in a RAMlocation, and eachtime theprogramwrites the PRPRit writes also the image register.The image register must be written first, so if an interruptoccurs between the two instructions the PRPR is not affected.

Table 3. ST639x ProgramROM Page Register Coding

D7-D5. These bits are not used. PRPR4-PRPR0. These are the program ROM

banking bits and thevalue loaded selects the corresponding page to be addressedin the lower part of 4Kprogramaddress spaceas specifiedin Table

3. Thisregisteris undefined onreset. Note. The number of bits implemented depends

on the size of the ROM of the device. Only the lower part of address space has been bankswitched because interrupt vectors and common subroutines should beavailable all the time. The reason of this structure is due to the fact that it is not possible to jump from a dynamic page to another, unless jumping back to the static page, changingcontents of PRPR,and, than,jumping to a differentdynamic page.

Care is required when handlingthe PRPR as it is write only. For this reason, it is not allowed to change the PRPR contents while executing interrupts drivers, as the driver cannot save and than restore its previous content. Anyway, this operation may be necessaryif the sum ofcommonroutines and interrupt drivers will take more than 2K bytes;in thiscase could benecessaryto dividethe

PRPR3 PRPR2 PRPR1 PRPR0 PC11

XXXX1

00000Page 0

00010

00100Page 2 00110Page 3 01000Page 4 01010Page 5 01100Page 6 01110Page 7 10000Page 8 10010Page 9

Memory Page

Static Page (Page 1)

Page 1 (Static Page)

11/64



ST6391,92,93,95,97,99

MEMORY SPACES(Continued) Table 4. ST639x Program ROM Map (up to 20K Bytes)

ROM Page Device Address Description

PAGE 0

PAGE 1 “STATIC”

PAGE 2

PAGE 3

PAGE 4

PAGE 5

PAGE 6

PAGE 7

PAGE 8

0000h-007Fh 0080h-07FFh

0800h-0F9Fh

0FA0h-0FEFh

0FF0h-0FF7h 0FF8h-0FFBh 0FFCh-0FFDh 0FFEh-0FFFh

0000h-000Fh

0010h-07FFh

0000h-000Fh

0010h-07FFh

0000h-000Fh

0010h-07FFh

0000h-000Fh

0010h-07FFh

0000h-000Fh

0010h-07FFh

0000h-000Fh

0010h-07FFh

0000h-000Fh

0010h-07FFh

Reserved User ROM

User ROM Reserved Interrupt Vectors Reserved NMI Vector Reset Vector

Reserved User ROM

Reserved User ROM (End of 16KST6391,93,99)

Reserved User ROM

PAGE 9

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0000h-000Fh

0010h-07FFh



Reserved User ROM (End of 20KST6392,95,97)

MEMORY SPACES(Continued) Data Space

The instruction set of the ST639x Core operates on a specific space, named Data Space that contains all the data necessary for the processing of the program. The Data Spaceal-

ST6391,92,93,95,97,99

lows the addressing of RAM (256 bytes for the ST639x family), EEPROM (up to 384 bytes), ST639xCore/peripheralregisters,andread-only datasuch asconstantsand thelook-uptables.

Figure14. ST639x Data Space

b7 b0

DATA RAM/EEPROM/OSD

BANK AREA

DATA ROM

WINDOW AREA

X REGISTER 080h Y REGISTER 081h V REGISTER 082h

W REGISTER 083h

DATA RAM

PORT ADATAREGISTER 0C0h PORT BDATAREGISTER 0C1h PORT CDATA REGISTER 0C2h

RESERVED 0C3h PORT ADIRECTION REGISTER 0C4h PORT BDIRECTION REGISTER 0C5h

PORT CDIRECTION REGISTER 0C6h

RESERVED 0C7h

INTERRUPT OPTION REGISTER 0C8h DATA ROM WINDOW REGISTER 0C9h

PROGRAM ROM PAGE REGISTER 0CAh

RESERVED 0CBh

SPI DATAREGISTER 0CCh

RESERVED

TIMER 1PRESCALER REGISTER 0D2h

TIMER 1 COUNTER REGISTER 0D3h

TIMER1 STATUS/CONTROL REG. 0D4h

RESERVED

WATCHDOG REGISTER 0D8h

000h

03Fh 040h

07Fh

084h

0BFh

0CDh

0D1h

0D5h

0D7h

Figure15. ST639x Data Space (Continued)

b7 b0

RESERVED 0D9h

TIMER 2 PRESCALER REGISTER 0DAh

TIMER2 COUNTER REGISTER 0DBh

TIMER 2STATUSCONTROL REG. 0DCh

0DDh

RESERVED

0DFh DA0 DATA/CONTROL REGISTER 0E0h DA1 DATA/CONTROL REGISTER 0E1h DA2 DATA/CONTROL REGISTER 0E2h DA3 DATA/CONTROL REGISTER 0E3h

AFC, IR & OSD RESULT REGISTER 0E4h

OUTPUTS CONTROL REGISTER 0E5h DA4 DATA/CONTROL REGISTER 0E6h DA5 DATA/CONTROL REGISTER 0E7h

DATA RAM BANK REGISTER 0E8h

DEDIC. LATCHES CONTROL REG. 0E9h

EEPROMCONTROL REGISTER 0EAh

SPICONTROL REGISTER 1 0EBh SPICONTROL REGISTER 2 0ECh

OSD CHARAC. BANK SELECT REG. 0EDh

0F0h

RESERVED

0FEh

ACCUMULATOR 0FFh

OSDCONTROLREGISTERSLOCATED

IN PAGE6 OFBANKED DATA RAM

VERTICAL START ADDRESS REG. 010h

HORIZONTALSTARTADDRESSREG. 011h

VERTICAL SPACE REGISTER 012h

HORIZONTAL SPACEREGISTER 013h

BACKGROUND COLOUR REGISTER 014h

GLOBAL ENABLEREGISTER 017h

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ST6391,92,93,95,97,99

MEMORY SPACES(Continued) Data ROM Addressing. Allthe read-onlydata ar e

physic allyimplem entedin theROM inwhich theProgramSpaceisalsoimplemented.TheROMtherefore containstheprogramto beexecutedandalsotheconstantsandthelook-uptablesneededforthe program. Thelocat i onsofDataSpaceinwhichthedifferentconstants and look-up tables are addressed by the ST639xCore can be considered as beinga 64-by t e window throughwhich itis possi bl eto accessto the read-onlydatastored in the ROM. This window is locatedfromthe40haddressto the7Fh addressin the Data space and allowsthe directreadingofthebytes from the 000h address to the 03Fh address in the ROM.AllthebytesoftheROMcanbeusedtostore eitherinstructi onsor read-onlydata. Indeed,thewindowcanbemovedbystepof64bytesalongtheROM in writi ngthe appropr i atecodein the Write-onlyData ROMWindowre gi s te r(DRW R, locationC9h).Theeffectiveaddressof the byte tobe read as a datain the ROM is obtainedby the concatenationof the 6 less significant bits of the address in the Data Space(as lesssignifi c ant bits)and the contentoftheDRWR(as most significant bits). So when addressing location 40hofdataspace,and 0 isloadedin the DRWR,the physic aladdress edlocat i oninROMis00h.

Note. The dataROM window cannot addresswindows abovethe 16k byte range.

Figure17. Data ROM Window Memory Addressing

Figure16. Data ROM Window Register

DWR

Data ROMWindow Register

(C9h, Write Only)

D7 D6 D5 D4 D3 D2 D1 D0

DWR0 = Data ROMWindow 0 DWR1 = Data ROMWindow 1 DWR2 = Data ROMWindow 2 DWR3 = Data ROMWindow 3 DWR4 = Data ROMWindow 4 DWR5 = Data ROMWindow 5 DWR6 = Data ROMWindow 6 DWR7 = Data ROMWindow 7

DWR7-DWR0. These are the Data Rom Window bits that correspond to the upper bits ofdata ROM program space. This registeris undefinedafter reset.

Note.Careis requiredwhenhandlingtheDRWRas it is write only. For this reason, it is not allowed to change the DRWR contents while executing interruptsdrivers, as thedrivercannotsaveand thanrestoreits previouscontent.If it is impossibleto avoid thewriting ofthisregisterininterruptsdrivers, animageofthisregistermustbesavedinaRAMlocation, and each time the program writes the DRWR it writes also the image register. The image register must be written first, so if an interrupt occurs betweenthe two instructionsthe DRWRregister is not affected.

DATA ROM

WINDOW REGISTER

CONTENTS

(DWR)

Example:

DWR=28h

ROM

ADDRESS:A19h

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65432 0

11000000001

67891011

0000



543210

PROGRAM SPACE ADDRESS

DATA SPACE ADDRESS

READ

40h-7Fh

IN INSTRUCTION

59h

VR01573B

MEMORY SPACES(Continued)

ST6391,92,93,95,97,99

Data RAM/EEPROM/OSDRAM Addressing

InallmembersoftheST639xfamily64bytesofdata RAMaredirectlyaddressableinthe dataspacefrom 80h to BFh addresses.The additional192 bytes of RAM, the 384 bytes of EEPROM , and the OSD RAM can be addressed using the banks of 64 bytes located between addresses 00h and 3Fh. The selectionof the bank is done by programming the Data RAM Bank Register (DRBR) located at the E8h address of the Data Space. In this way each bankofRAM,EEPROMorOSDRAMcan select 64 bytes at a time. No more than one bank should beset at a time.

Figure18. Data RAMBank Register

DRBR

Data RAM

Bank Register

(E8h, Write Only)

D7 D6 D5 D4 D3 D2 D1 D0

DRBR0 DRBR1 DRBR2 DRBR3 DRBR4 DRBR5 DRBR6 DRBR7

DRBR7,DRBR1,DRBR0. These bits select the EEPROM pages.

DRBR6, DRBR5.Each of these bits, when set,will selectone OSDRAM register page.

DRBR4,DRBR3,DRBR2.Each of these bits,when set,will select one RAM page.

This registeris undefined afterreset. Table 5 summarizes how to set the Data RAM

Bank Register in order to select the various banks or pages.

Note :

Care is required when handling the DRBR asit is write only. For this reason, it is not allowed to change the DRBR contentswhile executing interrupts drivers, as the driver cannot save and than restore its previous content. If it is impossible to avoid the writing of this register in interrupts drivers, an image of this register must be saved in a RAM location, and each time the program writes the DRBRit writes also the image register. The image registermustbe written first,so if an interrupt occurs between the two instructions the DRBR is not affected.

Table 5. Data RAMBank Register Set-up

DRBR Value

Hex. Binary

01h 0000 0001 EEPROM Page 0 02h 0000 0010 EEPROM Page 1 03h 0000 0011 EEPROM Page 2 81h 1000 0001 EEPROM Page 3 82h 1000 0010 EEPROM Page 4 83h 1000 0011 EEPROM Page 5 04h 0000 0100 RAM Page 2 08h 0000 1000 RAM Page 3 10h 0001 0000 RAM Page 4 20h 0010 0000 OSD Page 5 40h 0100 0000 OSD Page 6

Selection

All devices

ST6395 and ST6397

ONLY

All devices

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ST6391,92,93,95,97,99

MEMORY SPACES(Continued) EEPROMDescription

The data space of ST639x family from 00h to 3Fh is paged as described in Table 5. 384 bytes of EEPROMlocated in sixpages of64 bytes (pages 0,1,2,3,4and 5, see Table 5).

Through the programmingof theData RAM Bank Register (DRBR=E8h) the user can select the bank or page leaving unaffected the way to address the static registers. The way to address the “dynamic”page is tosetthe DRBRas described in Table 5(e.g.toselectEEPROMpage 0,the DRBR has to be loaded with content 01h, see Data RAM/EEPROM/OSD RAM addressing for additional information).Bits 0, 1 and 7 of the DRBR are dedicated tothe EEPROM.

The EEPROM pages do not require dedicated instructions to be accessedin readingor writing.The EEPROM is controlled by the EEPROM Control Register(EECR=EAh). AnyEEPROM locationcan bereadjust likeanyotherdatalocation,alsointerms ofaccesstime.

To write an EEPROM location takes an average time of 5 ms (10ms max) and during this timethe EEPROM is not accessible by the Core. A busy flag canbe readby the Coretoknow the EEPROM status before trying any access. In writing the EEPROM can work in two modes: Byte Mode (BMODE) and Parallel Mode (PMODE). The BMODE is the normal way to use the EEPROM and consistsin accessingone byte at atime. The PMODE consists inaccessing 8 bytesper time.

Figure19. EEPROM Control Register

EECR

EEPROM Control Register

(EAh, Read/Write)

D7 D6 D5 D4 D3 D2 D1 D0

EN = EEPROMEnable Bit BS = EEPROM Busy Bit PE = Parallel Mode Enable Bit PS = Parallel Start Bit Reserved (Mustbe set Low) Reserved (Mustbe set Low) SB =Stand-by Enable Bit Unused

D7. Not used SB.WRITEONLY. Ifthis bit isset theEEPROMis

disabled(any accesswill bemeaningless)and the power consumption of the EEPROMis reducedto the leakage values.

D5, D4. Reserved for testingpurposes,they must be setto zero.

PS.SET ONLY. Oncein Parallel Mode,assoon as the usersoftwaresets the PSbitthe parallelwriting of the 8 adjacentregisters will start.PSis internally reset at the end of the programming procedure. Note that less than 8 bytes can be written; after parallel programming the remaining undefined bytes will haveno particular content.

PE. WRITE ONLY. This bit must be set by the user program in orderto performparallelprogramming (more bytes per time). If PE is set and the “parallelstartbit”(PS)is low, upto 8adjacentbytes can be writtenat the maximum speed, the content being storedin volatileregisters.These 8 adjacent bytes can be considered as row, whose A7, A6, A5, A4, A3 are fixed while A2, A1 and A0 are the changing bytes. PE is automatically reset at the end of any parallel programming procedure. PE can be reset by the user software before starting the programming procedure, leaving unchanged the EEPROMregisters.

BS.READ ONLY. This bitwill be automaticallyset by the CORE when the user program modifies an EEPROMregister. The user program hasto test it before any read or write EEPROM operation; any attemptto access the EEPROM while “busy bit” is setwillbeabortedandthewriting procedureinprogress completed.

EN. WRITE ONLY.This bit MUSTbe set to one in order to write any EEPROM register. If the user program will attempt to write the EEPROM when EN= “0” the involved registers will be unaffected and the“busy bit”will notbe set.

AfterRESETthecontentofEECRregist erwi llbe 00h.

Notes :

When the EEPROM is busy (BS=“1”) the EECR can notbe accessed inwrite mode, it is only possible to read BSstatus.This implies that as long as the EEPROM is busy it is not possible to change the status of the EEPROMcontrol register. EECR bits 4 and 5 are reserved for test purposes, and must never be set to “1”.

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ST6391,92,93,95,97,99

MEMORY SPACES(Continued) Additional Notes on Parallel Mode. If the user

wants to perform a parallel programming the first action should bethe set toone thePE bit; from this moment the first time the EEPROM will be addressed in writing, the ROW address will be latched and it will be possible to change it only at the end ofthe programming procedureor byresetting PE without programming the EEPROM.After the ROWaddress latching the Core can “see” just one EEPROMrow (the selected one) and any attempt to write or read other rows will produceerrors. Donot read the EEPROMwhile PEis set.

As soon asPE bitis set,the 8volatile ROWlatches are cleared. From this moment the user can load data in the whole ROW or just in a subset.PS setting willmodify theEEPROM registerscorresponding to the ROW latches accessed after PE. For example, if the software sets PE and accesses EEPROM in writing at addresses18h,1Ah,1Bhand thensetsPS,thesethreeregisterswillbemodifiedat thesame time;the remainingbyteswill haveno particularcontent.NotethatPE isinternallyresetat the endof theprogramming procedure.Thisimplies that the user must set PE bit between two parallelprogrammingprocedures.Anywaytheusercansetand thenresetPEwithoutperforminganyEEPROMprogramming.PS is a setonly bitand isinternallyreset atthe end of the programmingprocedure.Notethat if theusertriestosetPSwhilePEisnotsettherewill not be any programming procedure and the PS bit will be unaffected.ConsequentlyPS bitcan not be setifENis low.PScanbeaffectedbytheusersetif, andonlyif,ENand PE bits arealsosetto one.

INTERRUPT

The ST639x Core can manage 4 different maskable interrupt sources, plus one non-maskable interrupt source (top priority level interrupt). Each sourceisassociated with aparticularinterruptvector that contains a Jump instruction to the related interrupt serviceroutine. Each vector is located in the Program Space at a particular address (see Table 6). When a source provides an interruptrequest, and therequest processingis alsoenabled by the ST639x Core,then thePCregisterisloaded with the address of the interrupt vector (i.e.of the Jumpinstruction).Finally,the PCis loaded withthe address of the Jump instruction and the interrupt routine is processed.

The relationship between vector and source and the associatedpriority ishardware fixed for the differentST639xdevices. Forsome interrupt sources it is also possible to select by software the kind of event that will generatethe interrupt.

All interruptscan be disabled by writing to theGEN bit (global interruptenable) of the interrupt option register (address C8h). Aftera reset,ST639x is in non maskable interruptmode, so no interrupts will be accepted and NMI flags will be used, until a RETI instruction is executed.If an interruptis executed, one special cycle is made by the core,during that the PC is set to the related interrupt vector address. A jump instructionat thisaddress has to redirect program execution to thebeginningof the relatedinterruptroutine.Theinterruptdetectingcycle, also resets the relatedinterrupt flag(not available to the user), so that another interrupt can be stored for this current vector, while its driver is under execution.

If additionalinterruptsarrivefromthe same source, they will be lost. NMI can interrupt other interrupt routines at any time,while other interrupts cannot interrupt each other. If more than one interrupt is waiting forservice, they are executed according to their priority. The lower the number, the higher the priority. Priority is, therefore, fixed. Interrupts are checked during the last cycle of an instruction (RETIincluded). Level sensitive interrupts have to be validduring this period.

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