ZILOG Z86247 Datasheet

GENERAL DESCRIPTION

CPS DC-9027-00

Z86247

PRELIMINARY
CUSTOMER PROCUREMENT SPECIFICATION

Z86247

40-PIN LOW-COST DIGIT AL
TELEVISION CONTROLLER (4LDTC)

The Z86247 40-pin Low-Cost Digital Television Controller
(4LDTC) introduces a new level of sophistication to single­chip architecture. The Z86247 is a member of the Z8
single-chip microcontroller family with 8 Kbytes of ROM
and 236 bytes of RAM. The device is offered in a 40-pin
package and is CMOS compatible. The 4LDTC offers
mask programmed ROM which enables the Z8
microcontroller to be used in a high volume production
application device embedded with a custom program
(customer supplied program) and combines together with
the Z86C27 (DTC) and Z86127 (LDTC) to provide support
for high end, mid range and low end TV applications.

Zilog’s 4LDTC offers fast execution, efficient use of memory,
sophisticated interrupts, input/output bit manipulation
capabilities, and easy hardware/software system expansion
along with low cost and low power consumption. The
device provides an ideal performance and reliability solution
for consumer and industrial television applications.

The Z86247 architecture is characterized by utilizing Zilog’s
advanced Superintegration™ design methodology. The
device has an 8-bit internal data path controlled by a Z8
microcontroller and On Screen Display (OSD) logic circuits
and Pulse Width Modulators (PWM). On-chip peripherals
include two register mapped I/O ports (Ports 2 and Port 3),
interrupt control logic (one software, two external and three
internal interrupts) and a standby mode recovery input
port (Port 3, pin P30).

A 14-bit PWM port provides enough voltage resolution for
a voltage synthesizer tuning system. Three 6-bit PWM

®

ports are used for controlling audio signal levels. Three
8-bit PWM ports used to vary picture levels.

The 4LDTC applications demand powerful I/O capabilities.
The Z86247 fulfills this with 24 pins dedicated to input or
output. These lines are grouped into three ports, and are
configurable under software control to provide timing,
status signals, parallel I/O and an address/data bus for
interfacing to external memory.

There are three basic address spaces available to support
this wide range of configurations: Program Memory, Video
RAM, and Register File. The Register File is composed of
236 bytes of general purpose registers, two I/O Port
registers, 15 control and status registers and three reserved
registers.

To unburden the program from coping with the real-time
problems such as counting/timing and data communication,
the 4LDTC offers two on-chip counter/timers with a large
number of user selectable modes (Figure 1).

Notes:

All Signals with a preceding front slash, "/", are active Low, e.g.:
B//W (WORD is active Low); /B/W (BYTE is active Low, only).

Power connections follow conventional descriptions below:

The OSD control circuits support 8 rows by 20 columns of
characters. The character color is specified by row. One of
the eight rows is assigned to show two kinds of colors for
bar type displays such as volume control. The OSD is
capable of displaying high resolution (11x15 dot pattern)
characters.

DC 9027-00 (7-27-94)

Connection Circuit Device

Power V

Ground GND V

CC

V

DD

SS

1

GENERAL DESCRIPTION (Continued)

T

CPS DC-9027-00

Z86247

XTAL1
XTAL2

/RESET

P30
P31

P34
P35

P36

P60

P61

P62

P63

P64
P65

AFCIN

RESET

Oscillator

WDT

Counter

Timer

Counter

Timer

Port 3/

Interrupt

Port 6

(Control)

8 KByte

Program ROM

Z8 CPU

Core

256 Byte

Register File

Port 0

Port 1

A8-15 AD0-7

Port 2

PWM 1

14 -bit

PWM 6

to

PWM 8

6-bit

PWM 9

to

PWM11

P27
P26

P25
P24

P23
P22

P21
P20

PWM 1

PWM 6
PWM 7

PWM 8

PWM 9
PWM 10

PWM 11

128 Byte

Character RAM

4 KByte

Character ROM

Functional Block Diagram

On Screen

Display

OSCIN
OSCOU

HSYNC
VSYNC

VRED
VGREEN

VBLUE
VBLANK

2

PIN CONFIGURATION

CPS DC-9027-00

Z86247

PWM1

P35
P36

P34
P31

P30

XTAL1
XTAL2

/RESET

P60

GND

P61
P62

VCC

P63
P64
P65

AFCIN

OSCIN

OSCOUT

1
2
3
4
5
6
7
8

9
10
11
12
13
14
15
16
17
18
19
20

Z86247
(LDTC)

40
39
38
37
36
35

34
33
32
31
30
29
28
27
26
25
24
23
22
21

PWM6
PWM7
PWM8
PWM9
PWM10
PWM11
P27
P26
P25
P24
P23
P22

P21
P20
VBLANK
VBLUE
VGREEN
VRED
VSYNC

HSYNC

40-Pin Mask-ROM Plastic DIP

3