The W78E516B is an 8-bit microcontroller which has an in-system programmable MTP-ROM for
firmware updating. The instruction set of the W78E516B is fully compatible with the standard 8052.
The W78E516B contains a 64K bytes of main MTP-ROM and a 4K bytes of auxiliary MTP-ROM
which allows the contents of the 64KB main MTP-ROM to be updated by the loader program located
at the 4KB auxiliary MTP-ROM; 512 bytes of on-chip RAM; four 8-bit bi-directional and bitaddressable I/O ports; an additional 4-bit port P4; three 16-bit timer/counters; a serial port. These
peripherals are supported by a eight sources two-level interrupt capability. To facilitate programming
and verification, the MTP-ROM inside the W78E516B allows the program memory to be programmed
and read electronically. Once the code is confirmed, the user can protect the code for security.
The W78E516B microcontroller has two power reduction modes, idle mode and power-down mode,
both of which are software selectable. The idle mode turns off the processor clock but allows for
continued peripheral operation. The power-down mode stops the crystal oscillator for minimum power
consumption. The external clock can be stopped at any time and in any state without affecting the
processor.
FEATURES
• Fully static design 8-bit CMOS microcontroller up to 40 MHz.
• 64K bytes of in-system programmable MTP-ROM for Application Program (APROM).
• 4K bytes of auxiliary MTP-ROM for Loader Program (LDROM).
• 512 bytes of on-chip RAM. (including 256 bytes of AUX-RAM, software selectable)
• 64K bytes program memory address space and 64K bytes data memory address space.
ALE O H ADDRESS LATCH ENABLE: ALE is used to enable the address latch that
RST I L RESET: A high on this pin for two machine cycles while the oscillator is
XTAL1 I CRYSTAL 1: This is the crystal oscillator input. This pin may be driven by an
XTAL2 O CRYSTAL 2: This is the crystal oscillator output. It is the inversion of XTAL1.
VSS I GROUND: ground potential.
VDD I POWER SUPPLY: Supply voltage for operation.
I EXTERNAL ACCESS ENABLE: This pin forces the processor to execute the
external ROM. The ROM address and data will not be presented on the bus if
the EA pin is high.
O H
I/O D PORT 0: Function is the same as that of standard 8052.
I/O H PORT 1: Function is the same as that of standard 8052.
I/O H PORT 2: Port 2 is a bi-directional I/O port with internal pull-ups. This port also
I/O H PORT 3: Function is the same as that of the standard 8052.
I/O H PORT 4: A bi-directional I/O. See details below.
PROGRAM STORE ENABLE: PSEN enables the external ROM data in the
Port 0 address/data bus. When internal ROM access is performed, no
strobe signal outputs originate from this pin.
separates the address from the data on Port 0. ALE runs at 1/6th of the
oscillator frequency.
running resets the device.
external clock.
provides the upper address bits for accesses to external memory.
DESCRIPTIONS
PSEN
* Note:
PORT4
Another bit-addressable port P4 is also available and only 4 bits (P4<3:0>) can be used. This port
address is located at 0D8H with the same function as that of port P1,
Example:
P4 REG 0D8H
MOV P4, #0AH ; Output data "A" through P4.0−P4.3.
MOV A, P4 ; Read P4 status to Accumulator.
SETB P4.0 ; Set bit P4.0
CLR P4.1 ; Clear bit P4.1
The W78E516B architecture consists of a core controller surrounded by various registers, four
general purpose I/O ports, one special purpose programmable 4-bits I/O port, 512 bytes of RAM,
three timer/counters, a serial port and an internal 74373 latch and 74244 buffer which can be
switched to port2. The processor supports 111 different opcodes and references both a 64K program
address space and a 64K data storage space.
RAM
The internal data RAM in the W78E516B is 512 bytes. It is divided into two banks: 256 bytes of
scratchpad RAM and 256 bytes of AUX-RAM. These RAMs are addressed by different ways.
•
RAM 0H−127H can be addressed directly and indirectly as the same as in 8051. Address pointers
are R0 and R1 of the selected register bank.
•
RAM 128H−255H can only be addressed indirectly as the same as in 8051. Address pointers are
R0, R1 of the selected registers bank.
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W78E516B
INT1
•
AUX-RAM 0H−255H is addressed indirectly as the same way to access external data memory with
the MOVX instruction. Address pointer are R0 and R1 of the selected register bank and DPTR
register. An access to external data memory locations higher than 255H will be performed with the
MOVX instruction in the same way as in the 8051. The AUX-RAM is disable after a reset. Setting
the bit 4 in CHPCON register will enable the access to AUX-RAM. When AUX-RAM is enabled the
instructions of "MOVX @Ri" will always access to on-chip AUX-RAM. When executing from internal
program memory, an access to AUX-RAM will not affect the Ports P0, P2, WR and RD.
Timers 0, 1, and 2
Timers 0, 1, and 2 each consist of two 8-bit data registers. These are called TL0 and TH0 for Timer
0, TL1 and TH1 for Timer 1, and TL2 and TH2 for Timer 2. The TCON and TMOD registers provide
control functions for timers 0, 1. The T2CON register provides control functions for Timer 2. RCAP2H
and RCAP2L are used as reload/capture registers for Timer 2. The operations of Timer 0 and Timer
1 are the same as in the W78C51. Timer 2 is a 16-bit timer/counter that is configured and controlled
by the T2CON register. Like Timers 0 and 1, Timer 2 can operate as either an external event counter
or as an internal timer, depending on the setting of bit C/T2 in T2CON. Timer 2 has three operating
modes: capture, auto-reload, and baud rate generator. The clock speed at capture or auto-reload
mode is the same as that of Timers 0 and 1.
Clock
The W78E516B is designed with either a crystal oscillator or an external clock. Internally, the clock is
divided by two before it is used by default. This makes the W78E516B relatively insensitive to duty
cycle variations in the clock.
Crystal Oscillator
The W78E516B incorporates a built-in crystal oscillator. To make the oscillator work, a crystal must
be connected across pins XTAL1 and XTAL2. In addition, a load capacitor must be connected from
each pin to ground, and a resistor must also be connected from XTAL1 to XTAL2 to provide a DC
bias when the crystal frequency is above 24 MHz.
External Clock
An external clock should be connected to pin XTAL1. Pin XTAL2 should be left unconnected. The
XTAL1 input is a CMOS-type input, as required by the crystal oscillator. As a result, the external clock
signal should have an input one level of greater than 3.5 volts.
Power Management
Idle Mode
Setting the IDL bit in the PCON register enters the idle mode. In the idle mode, the internal clock to
the processor is stopped. The peripherals and the interrupt logic continue to be clocked. The
processor will exit idle mode when either an interrupt or a reset occurs.
Power-down Mode
When the PD bit in the PCON register is set, the processor enters the power-down mode. In this
mode all of the clocks are stopped, including the oscillator. To exit from power-down mode is by a
hardware reset or external interrupts INT0 to
when enabled and set to level triggered.
Reduce EMI Emission
The W78E516B allows user to diminish the gain of on-chip oscillator amplifier by using programmer
Publication Release Date: February 2000
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Page 6
W78E516B
to clear the B7 bit of security register. Once B7 is set to 0, a half of gain will be decreased. Care must
be taken if user attempts to diminish the gain of oscillator amplifier, reducing a half of gain may affect
the external crystal operating improperly at high frequency above 24 MHz. The value of R and C1, C2
may need some adjustment while running at lower gain.
Reset
The external RESET signal is sampled at S5P2. To take effect, it must be held high for at least two
machine cycles while the oscillator is running. An internal trigger circuit in the reset line is used to
deglitch the reset line when the W78E516B is used with an external RC network. The reset logic also
has a special glitch removal circuit that ignores glitches on the reset line. During reset, the ports are
initialized to FFH, the stack pointer to 07H, PCON (with the exception of bit 4) to 00H, and all of the
other SFR registers except SBUF to 00H. SBUF is not reset.
W78E516B Special Function Registers (SFRs) and Reset Values
F8
F0 +B
00000000
E8
E0 +ACC
00000000
D8
D0 +PSW
C8 +T2CON
C0 XICON
B8 +IP
B0 +P3
A8 +IE
A0 +P2
98 +SCON
90 +P1
88 +TCON
80 +P0
Notes:
1.The SFRs marked with a plus sign(+) are both byte- and bit-addressable.
2. The text of SFR with bold type characters are extension function registers.
+P4
xxxx1111
00000000
00000000
00000000
00000000
00000000
00000000
11111111
00000000
11111111
00000000
11111111
E7
DF
D7
RCAP2L
00000000
A7
SBUF
xxxxxxxx
TMOD
00000000
SP
00000111
SFRAL
TL0
00000000
DPL
00000000
RCAP2H
00000000
TL1
00000000
DPH
00000000
TL2
00000000
00000000
TH0
00000000
TH2
00000000
SFRAH
00000000
TH1
00000000
CHPENR
00000000
CF
SFRFD
00000000
B7
97
8F
PCON
00000000
CHPCON
0xx00000
00110000
F7
EF
SFRCN
AF
FF
C7
BF
9F
87
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W78E516B
Port 4 (D8H)
BIT NAME FUNCTION
7 - Reserve
6 - Reserve
5 - Reserve
4 - Reserve
3 P43 Port 4 Data bit which outputs to pin P4.3.
2 P42 Port 4 Data bit. which outputs to pin P4.2.
1 P41 Port 4 Data bit. which outputs to pin P4.1.
0 P40 Port 4 Data bit which outputs to pin P4.0.
In-System Programming (ISP) Mode
The W78E516B equips one 64K byte of main MTP-ROM bank for application program (called
APROM) and one 4K byte of auxiliary MTP-ROM bank for loader program (called LDROM). In the
normal operation, the microcontroller executes the code in the APROM. If the content of APROM
needs to be modified, the W78E516B allows user to activate the In-System Programming (ISP) mode
by setting the CHPCON register.
specific values 87H, then 59H sequentially to the CHPENR register to enable the CHPCON
write attribute. Writing CHPENR register with the values except 87H and 59H will close
CHPCON register write attribute.
including enter/exit ISP Mode, program, erase, read ... etc, during device in the idle mode. Setting the
bit CHPCON.0 the device will enter in-system programming mode after a wake-up from idle mode.
Because device needs proper time to complete the ISP operations before awaken from idle mode,
software may use timer interrupt to control the duration for device wake-up from idle mode. To
perform ISP operation for revising contents of APROM, software located at APROM setting the
CHPCON register then enter idle mode, after awaken from idle mode the device executes the
corresponding interrupt service routine in LDROM. Because the device will clear the program counter
while switching from APROM to LDROM, the first execution of RETI instruction in interrupt service
routine will jump to 00H at LDROM area. The device offers a software reset for switching back to
APROM while the content of APROM has been updated completely.
1 and 7 to logic-1 will result a software reset to reset the CPU
external reset. This in-system programming feature makes the job easy and efficient in which the
application needs to update firmware frequently. In some applications, the in-system programming
feature make it possible to easily update the system firmware without opening the chassis.
The CHPCON is read-only by default, software must write two
The W78E516B achieves all in-system programming operations
Setting CHPCON register bit 0,
. The software reset serves as a
SFRAH, SFRAL:
SFRFD:
SFRCN:
- 7 - Revision A3
The programming data for on-chip MTP-ROM in programming mode.
The control byte of on-chip MTP-ROM programming mode.
The objective address of on-chip MTP-ROM in the in-system programming mode.
SFRFAH contains the high-order byte of address, SFRFAL contains the low-order
byte of address.
Publication Release Date: February 2000
Page 8
W78E516B
0: The Loader Program locates at the 64 KB APROM. 4KB LDROM is
SFRCN (C7)
BIT NAME FUNCTION
7 - Reserve.
6 WFWIN On-chip MTP-ROM bank select for in-system programming.
= 0: 64K bytes MTP-ROM bank is selected as destination for re-programming.
= 1: 4K bytes MTP-ROM bank is selected as destination for re-programming.
5 OEN MTP-ROM output enable.
4 CEN MTP-ROM chip enable.
3, 2, 1, 0 CTRL[3:0] The flash control signals
MODE WFWIN CTRL<3:0> OEN CEN SFRAH, SFRAL SFRFD
Erase 64KB APROM 0 0010 1 0 X X
Program 64KB APROM 0 0001 1 0 Address in Data in
Read 64KB APROM 0 0000 0 0 Address in Data out
Erase 4KB LDROM 1 0010 1 0 X X
Program 4KB LDROM 1 0001 1 0 Address in Data in
Read 4KB LDROM 1 0000 0 0 Address in Data out
In-System Programming Control Register (CHPCON)
CHPCON (BFH)
BIT NAME FUNCTION
7 SWRESET
(F04KMODE)
6 - Reserve.
5 - Reserve.
ENAUXRAM
4
3 0 Must set to 0.
2 0 Must set to 0.
1 FBOOTSL The Program Location Select.
When this bit is set to 1, and both FBOOTSL and FPROGEN are set to 1. It
will enforce microcontroller reset to initial condition just like power on reset.
This action will re-boot the microcontroller and start to normal operation. To
read this bit in logic-1 can determine that the F04KBOOT mode is running.
1: Enable on-chip AUX-RAM.
0: Disable the on-chip AUX-RAM
destination for re-programming.
1: The Loader Program locates at the 4 KB memory bank. 64KB APROM is
destination for re-programming.
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W78E516B
CHPCON (BFH), continued
BIT NAME FUNCTION
0 FPROGEN MTP-ROM Programming Enable.
= 1: enable. The microcontroller enter the in-system programming mode after
entering the idle mode and wake-up from interrupt. During in-system
programming mode, the operation of erase, program and read are
achieve when device enters idle mode.
= 0: disable. The on-chip flash memory is read-only. In-system
programmability is disabled.
F04KBOOT Mode (Boot From LDROM)
By default, the W78E516B boots from APROM program after a power on reset. On some occasions,
user can force the W78E516B to boot from the LDROM program via following settings. The possible
situation that you need to enter F04KBOOT mode when the APROM program can not run properly
and device can not jump back to LDROM to execute in-system programming function. Then you can
use this F04KBOOT mode to force the W78E516B jumps to LDROM and executes in-system
programming procedure. When you design your system, you may reserve the pins P2.6, P2.7 to
switches or jumpers. For example in a CD-ROM system, you can connect the P2.6 and P2.7 to PLAY
and EJECT buttons on the panel. When the APROM program fails to execute the normal application
program. User can press both two buttons at the same time and then turn on the power of the
personal computer to force the W78E516B to enter the F04KBOOT mode. After power on of personal
computer, you can release both buttons and finish the in-system programming procedure to update
the APROM code. In application system design, user must take care of the P2, P3, ALE, EA and
PSEN pin value at reset to prevent from accidentally activating the programming mode or
Software reset CPU and
re-boot from the 64KB
APROM.
MOV CHPENR,#87H
MOV CHPENR,#59H
MOV CHPCON,#83H
Yes
Hardware Reset
to re-boot from
new 64 KB APROM.
(S/W reset is
invalid in F04KBOOT
Mode)
End of erase
operation. CPU will
be wakened by Timer
interrupt.
PGM
END
Executing new code
from address
00H in the 64KB APROM.
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W78E516B
SECURITY
During the on-chip MTP-ROM programming mode, the MTP-ROM can be programmed and verified
repeatedly. Until the code inside the MTP-ROM is confirmed OK, the code can be protected. The
protection of MTP-ROM and those operations on it are described below.
The W78E516B has several Special Setting Registers, including the Security Register and
Company/Device ID Registers, which can not be accessed in programming mode. Those bits of the
Security Registers can not be changed once they have been programmed from high to low. They can
only be reset through erase-all operation. The contents of the Company ID and Device ID registers
have been set in factory. The Security Register is located at the 0FFFFH of the LDROM space.
D7 D6 D5D4 D3 D2 D1 D0
1 1 0 1 1 0 1 0
0 1 11 00 0
B7
B0: Lock bit, logic 0: active
B1: MOVC inhibit,
logic 0: the MOVC instruction in external memory
cannot access the code in internal memory.
logic 1: no restriction.
B2: Encryption
logic 0: the encryption logic enable
logic 1: the encryption logic disable
B07: Osillator Control
logic 0: 1/2 gain
logic 1: Full gain
Default 1 for all security bits.
Reserved bits must be kept in logic 1.
0
Reserved
B2
Company ID (#DAH)
Device ID (#62H)
Security Bits
B0B1
Special Setting Registers
4KB MTP ROM
Program Memory
LDROM
Reserved
Reserved
Security Register
0000h
0FFFh
64KB MTP ROM
Program Memory
APROM
FFFFh
Lock bit
This bit is used to protect the customer's program code in the W78E516B. It may be set after the
programmer finishes the programming and verifies sequence. Once this bit is set to logic 0, both the
MTP ROM data and Special Setting Registers can not be accessed again.
MOVC Inhibit
This bit is used to restrict the accessible region of the MOVC instruction. It can prevent the MOVC
instruction in external program memory from reading the internal program code. When this bit is set
to logic 0, a MOVC instruction in external program memory space will be able to access code only in
the external memory, not in the internal memory. A MOVC instruction in internal program memory
space will always be able to access the ROM data in both internal and external memory. If this bit is
logic 1, there are no restrictions on the MOVC instruction.
Encryption
This bit is used to enable/disable the encryption logic for code protection. Once encryption feature is
enabled, the data presented on port 0 will be encoded via encryption logic. Only whole chip erase will
reset this bit.
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W78E516B
Oscillator Control
W78E516B/E516 allow user to diminish the gain of on-chip oscillator amplifier by using programmer
to set the bit B7 of security register. Once B7 is set to 0, a half of gain will be decreased. Care must
be taken if user attempts to diminish the gain of oscillator amplifier, reducing a half of gain may
improperly affect the external crystal operation at high frequency above 24 MHz. The value of R and
C1, C2 may need some adjustment while running at lower gain.
ABSOLUTE MAXIMUM RATINGS
PARAMETER SYMBOL MIN. MAX. UNIT
DC Power Supply
DD
−
V
VSS
Input Voltage VIN VSS -0.3 VDD +0.3 V
Operating Temperature TA 0 70
Storage Temperature TST -55 +150
Note: Exposure to conditions beyond those listed under Absolute Maximum Ratings may adversely affect the life and reliability of the
device.
Input Current
P1, P2, P3, P4
Input Current
RST
Input Leakage Current
P0, EA
Logic 1 to 0 Transition Current
I
P1, P2, P3, P4
Input Low Voltage
P0, P1, P2, P3, P4, EA
DD
DD
SPECIFICATION TEST CONDITIONS
MIN. MAX. UNIT
4.5 5.5 V RST = 1, P0 = VDD
- 20 mA No load
VDD = 5.5V
IDLE
- 6 mA Idle mode
VDD = 5.5V
- 50
Power-down mode
µA
VDD = 5.5V
IN1
I
-50 +10
µ
A
VDD = 5.5V
VIN = 0V or VDD
IN2
I
-10 +300
µ
A
VDD = 5.5V
0< VIN <VDD
LK
I
-10 +10
µ
A
VDD = 5.5V
0V< VIN < VDD
[*4]
TL
-500 -
IL1
V
0 0.8 V VDD = 4.5V
µ
A
VDD = 5.5V
IN
V
= 2.0V
Publication Release Date: February 2000
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W78E516B
D.C. Electrical Characteristics, continued
PARAMETER SYM.SPECIFICATION TEST CONDITIONS
Input Low Voltage
IL2
V
RST
Input Low Voltage
[*4]
XTAL1
Input High Voltage
IL3
V
IH1
V
P0, P1, P2, P3, P4, EA
Input High Voltage
IH2
V
RST
Input High Voltage
[*4]
XTAL1
Output Low Voltage
IH3
V
OL1
V
P1, P2, P3, P4
Output Low Voltage
P0, ALE, PSEN
[*3]
Sink Current
OL2
V
Isk1 4 12 mA VDD = 4.5V
P1, P3, P4
Sink Current
P0, P2, ALE,
PSEN
Output High Voltage
Isk2 10 20 mA VDD = 4.5V
OH1
V
P1, P2, P3, P4
Output High Voltage
P0, ALE, PSEN
[*3]
Source Current
OH2
V
Isr1 -120 -250
P1, P2, P3, P4
Source Current
Isr2 -8 -20 mA VDD = 4.5V
P0, P2, ALE, PSEN
Notes:
*1. RST pin is a Schmitt trigger input.
*3. P0, ALE and
*4. XTAL1 is a CMOS input.
*5. Pins of P1, P2, P3 , P4 can source a transition current when they are being externally driven from 1 to 0. The transition current
reaches its maximum value when VIN approximates to 2V.
are tested in the external access mode.
PSEN
MIN. MAX. UNIT
0 0.8 V VDD = 4.5V
0 0.8 V VDD = 4.5V
2.4 VDD +0.2 V VDD = 5.5V
3.5 VDD +0.2 V VDD = 5.5V
3.5 VDD +0.2 V VDD = 5.5V
- 0.45 V VDD = 4.5V
IOL = +2 mA
- 0.45 V VDD = 4.5V
IOL = +4 mA
VIN = 0.45V
VIN = 0.45V
2.4 - V VDD = 4.5V
OH
I
= -100 µA
2.4 - V VDD = 4.5V
OH
I
= -400 µA
VDD = 4.5V
µ
A
VIN = 2.4V
VIN = 2.4V
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W78E516B
PSEN
PSEN
PSEN
PSEN
PSEN
PSEN
AC CHARACTERISTICS
The AC specifications are a function of the particular process used to manufacture the part, the
ratings of the I/O buffers, the capacitive load, and the internal routing capacitance. Most of the
specifications can be expressed in terms of multiple input clock periods (TCP), and actual parts will
usually experience less than a ±20 nS variation. The numbers below represent the performance
expected from a 0.6 micron CMOS process when using 2 and 4 mA output buffers.
1. The clock may be stopped indefinitely in either state.
2. The TCP specification is used as a reference in other specifications.
3. There are no duty cycle requirements on the XTAL1 input.
Program Fetch Cycle
PARAMETER SYMBOL MIN. TYP. MAX. UNIT NOTES
Address Valid to ALE Low T
Address Hold from ALE Low T
ALE Low to
Low
Low to Data Valid
Data Hold after
Data Float after
High
High
ALE Pulse Width T
Pulse Width
Notes:
1. P0.0−P0.7, P2.0−P2.7 remain stable throughout entire memory cycle.
2. Memory access time is 3 TCP.
3. Data have been latched internally prior to
4. "∆" (due to buffer driving delay and wire loading) is 20 nS.
AAS
1 TCP-∆
AAH
1 TCP-∆
APL
T
1 TCP-∆
PDA
T
- - 2 TCP nS 2
PDH
T
0 - 1 TCP nS 3
PDZ
T
0 - 1 TCP nS
ALW
2 TCP-∆
PSW
T
3 TCP-∆
going high.
- - nS 4
- - nS 1, 4
- - nS 4
2 TCP - nS 4
3 TCP - nS 4
Publication Release Date: February 2000
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W78E516B
RD
RD
WR
Data Read Cycle
PARAMETER SYMBOL MIN. TYP. MAX. UNIT NOTES
DAR
T
ALE Low to RD Low
DDA
Low to Data Valid
Data Hold from RD High
Data Float from RD High
Pulse Width
Notes:
1. Data memory access time is 8 TCP.
2. "∆" (due to buffer driving delay and wire loading) is 20 nS.
T
T
T
T
DDH
DDZ
DRD
3 TCP-∆
- - 4 TCP nS 1
0 - 2 TCP nS
0 - 2 TCP nS
6 TCP-∆
Data Write Cycle
PARAMETER SYMBOL MIN. TYP. MAX. UNIT
DAW
T
3 TCP-∆
1 TCP-∆
1 TCP-∆
6 TCP-∆
ALE Low to WR Low
Data Valid to WR Low
Data Hold from WR High
Pulse Width
T
DWD
T
DWR
T
DAD
-
3 T
CP+
∆
nS 1, 2
6 TCP - nS 2
-
3 TCP+∆
nS
- - nS
- - nS
6 TCP - nS
Note: "∆" (due to buffer driving delay and wire loading) is 20 nS.
Port Access Cycle
PARAMETER SYMBOL MIN. TYP. MAX. UNIT
Port Input Setup to ALE Low T
Port Input Hold from ALE Low T
Port Output to ALE T
Note: Ports are read during S5P2, and output data becomes available at the end of S6P2. The timing data are referenced to
ALE, since it provides a convenient reference.
This application note illustrates the in-system programmability of the Winbond W78E516B MTP-ROM
microcontroller. In this example, microcontroller will boot from 64 KB APROM bank and waiting for a
key to enter in-system programming mode for re-programming the contents of 64 KB APROM. While
entering in-system programming mode, microcontroller executes the loader program in 4KB LDROM
bank. The loader program erases the 64 KB APROM then reads the new code data from external
SRAM buffer (or through other interfaces) to update the 64KB APROM.
EXAMPLE 1:
;*******************************************************************************************************************
;* Example of 64K APROM program: Program will scan the P1.0. if P1.0 = 0, enters in-system
;* programming mode for updating the content of APROM code else executes the current ROM code.
;* XTAL = 40 MHz
;*******************************************************************************************************************
MOV R7,#FFH ; TH0 = FFH
MOV TL0,R6
MOV TH0,R7
MOV TMOD,#01H ; TMOD = 01H, SET TIMER0 A 16-BIT TIMER
MOV TCON,#10H ; TCON = 10H, TR0 = 1,GO
MOV PCON,#01H ; ENTER IDLE MODE FOR LAUNCHING THE IN-SYSTEM
; PROGRAMMABILITY
;********************************************************************************
;* Normal mode 64KB APROM program: depending user's application
;********************************************************************************
NORMAL_MODE:
. ; User's application program
.
.
.
EXAMPLE 2:
;*****************************************************************************************************************************
;* Example of 4KB LDROM program: This lorder program will erase the 64KB APROM first, then reads the new
;* code from external SRAM and program them into 64KB APROM bank. XTAL = 40 MHz
;************************************************************************
;* 4KB LDROM MAIN PROGRAM
;************************************************************************
ORG 100H