NEC PD78055 Benutzerhandbuch

µ

On-chip high-capacity ROM and RAM

1. The capacities of internal PROM and internal high-speed RAM can be changed by means of the

memory size switching register (IMS).

2. The capacity of internal high-speed RAM can be changed by means of 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: In main system clock 5.0 MHz operation)

to ultra-low speed (122 

µ

s: In subsystem clock 32.768 kHz operation)

Instruction set suited to system control

• Bit manipulation possible in all address spaces

• Multiply and divide instructions

I/O ports:  69 (N-ch open-drain ports: 4)

8-bit resolution A/D converter:  8 channels

8-bit resolution D/A converter:  2 channels

Serial interface:  3 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:  Five channels

• 16-bit timer/event counter :  1 channel

• 8-bit timer/event counter :  2 channels

• Watch timer :  1 channel

• Watchdog timer :  1 channel

22 vectored interrupt sources

2 test inputs

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

Supply voltage:  V

DD

 = 2.0 to 6.0 V

512 bytes

1024 bytes

1024 bytes

16 Kbytes

24 Kbytes

32 Kbytes

40 Kbytes

48 Kbytes

60 Kbytes

60 Kbytes

Internal High-Speed RAM

Internal Buffer RAM

Internal Expansion RAM

32 bytes

None

Program Memory

(ROM)

Data Memory

Part Number

Type

µ

PD78052Y

µ

PD78053Y

µ

PD78054Y

µ

PD78055Y

µ

PD78056Y

µ

PD78058Y

µ

PD78P058Y

1024 bytes

1024 bytes