NEC uPD78076 User Manual

Data Memory

Part Number

Type

Program Memory

(ROM)

µ

PD78076Y

µ

PD78078Y

µ

PD78P078Y

µ

Internal high-capacity ROM and RAM

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

(IMS).

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

switching register (IXS).

External memory expansion space:  64 Kbytes

Minimum instruction execution time changeable from high speed (0.4 

µ

s:  @ 5.0-MHz operation with main

system clock) to ultra-low speed (122 

µ

s:  @ 32.768-kHz operation with subsystem clock)

Instruction set suited to system control

•

Bit manipulation possible in all address spaces

•

Multiply and divide instructions incorporated

88 I/O port pins:  (including eight N-ch open-drain port pins)

8-bit resolution A/D converter:  8 channels

8-bit resolution D/A converter:  2 channels

Serial interface:  Three channels

•

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

2

C bus mode:  1 channel

•

3-wire serial I/O mode (Automatic transmit/receive function):  1 channel

•

3-wire serial I/O/UART mode:  1 channel

Timer:  Seven channels

•

16-bit timer/event counter :  1 channel

•

8-bit timer/event counter

:  4 channels

•

Watch timer

:  1 channel

•

Watchdog timer

:  1 channel

24 vectored interrupt sources

Two test inputs

Two types of on-chip clock oscillation circuits (main system clock and subsystem clock)

Power supply voltage:  1.8 to 5.5 V

1024 bytes

1024 bytes

48 Kbytes

60 Kbytes

60 Kbytes

Internal High-Speed RAM

Internal Buffer RAM Internal Expansion RAM

1024 bytes

32 bytes