NEC PD78078 用户手册

µ

Part Number

Mask ROM

PROM

48 Kbytes

60 Kbytes

60 Kbytes

High-speed RAM

1024 bytes

Buffer RAM

32 bytes

Expansion RAM

1024 bytes

1024 bytes

Memory space

64 Kbytes

General register

8 bits x 8 x 4 banks

With main system clock selected

0.4 

µ

s/0.8 

µ

s/1.6 

µ

s/3.2 

µ

s/6.4 

µ

s/12.8 

µ

s (@ 5.0-MHz operation)

With subsystem clock selected

122 

µ

s (@ 32.768-kHz operation)

Instruction set

• 16-bit operation

• Multiply/divide (8-bit x 8-bit, 16-bit/8-bit)

• Bit manipulate (set, reset, test, and Boolean operation)

• BCD adjust, etc.

I/O port

Total

: 88

• CMOS input

: 2

• CMOS input/output : 78

• N-ch open drain I/O : 8

A/D converter

8-bit resolution x 8 channels

D/A converter

8-bit resolution x 2 channels

Serial interface

• 3-wire serial I/O/2-wire serial I/O/I

2

C bus mode selection

: 1 channel

possible

• 3-wire serial I/O mode (maximum 32-byte on-chip automatic

transmit/receive function)

: 1 channel

• 3-wire serial I/O/UART mode selection possible

: 1 channel

Timer

• 16-bit timer/event counter : 1 channel

• 8-bit timer/event counter

: 4 channels

• Watch timer

: 1 channel

• Watchdog timer

: 1 channel

Timer output

5 outputs: (14-bit PWM output enable: 1, 8-bit PWM output enable: 2)

Clock output

19.5 kHz, 39.1 kHz, 78.1 kHz, 156 kHz, 313 kHz, 625 kHz, 1.25 MHz,

2.5 MHz, 5.0 MHz (@ 5.0-MHz operation with main system clock)

32.768 kHz (@ 32.768-kHz operation with subsystem clock)

Buzzer output

1.2 kHz, 2.4 kHz, 4.9 kHz, 9.8 kHz

(@ 5.0-MHz operation with main system clock)

1. The capacity of the internal PROM can be changed using the internal memory size switching register

(IMS).

2. The capacity of the internal expansion RAM can be changed using the internal expansion RAM size

switching register (IXS).

ROM

Internal

memory

Minimum
instruction
execution
time

µ

PD78076Y

µ

PD78078Y

µ

PD78P078Y

Item