
39
CHAPTER 1 OUTLINE
User’s Manual U12790EJ2V0UD
1.7 Functional Outline
(1/2)
Item
PD178076
PD178078
PD178096A
PD178098A
PD178F098
Internal
ROM
48 KB
60 KB
48 KB
60 KB
memory
(Mask ROM)
(Flash memory)
High-speed RAM 1024 bytes
Buffer RAM
32 bytes
Expansion RAM 1024 bytes
2048 bytes
1024 bytes
2048 bytes
General-purpose registers
8 bits
× 32 registers (8 bits × 8 registers × 4 banks)
Minimum instruction
 0.317
s/0.635 s/1.27 s/2.54 s/5.08 s (with crystal resonator of fX = 6.3 MHz)
execution time
 0.444
s/0.889 s/1.778 s/3.556 s/7.111 s (with crystal resonator of fX = 4.5 MHz)Note 1
Instruction set
 16-bit operation
 Multiplication/division (8 bits
× 8 bits, 16 bits ÷ 8 bits)
 Bit manipulation (set, reset, test, Boolean operation)
 BCD adjustment, etc.
I/O ports
Total:
80 pins
 CMOS input:
8 pins
 CMOS I/O:
64 pins
 N-ch open-drain output:
8 pins
A/D converter
8-bit resolution
× 8 channels
Serial interface
 3-wire/SBI/2-wire/I2C busNote 2
mode selectable: 1 channel
 3-wire mode: 1 channel
 3-wire mode (with automatic
transmit/receive function of up to
32 bytes): 1 channel
 UART mode: 1 channel
IEBus controller
Not provided
Provided
Timer
 Basic timer (timer carry FF (10 Hz)): 1 channel
 16-bit timer/event counter:
1 channel
 8-bit timer/event counter:
2 channels
 Watchdog timer:
1 channel
Buzzer output
BEEP0 pin: 1 kHz, 1.5 kHz, 3 kHz, 4 kHz
BUZ pin: 0.77 kHz, 1.54 kHz, 3.08 kHz, 6.15 kHz (with crystal resonator of fX = 6.3 MHz)
Notes 1. When using the IEBus controller of the
PD178096A, 178098A or 178F098, the 4.5 MHz crystal
resonator cannot be used. Use the 6.3 MHz crystal resonator.
2. When the I2C bus mode is used (including when the mode is implemented in software without using
the peripheral hardware), consult NEC Electronics when ordering a mask.
 3-wire/SBI/2-wire/I2C busNote 2
mode selectable: 1 channel
 3-wire mode: 1 channel
 3-wire mode (with automatic
transmit/receive function of up to
32 bytes): 1 channel
 3-wire/SBI/2-wire/
I2C busNote 2 mode
selectable: 1 channel
 3-wire mode:
1 channel
 3-wire mode (with
automatic transmit/
receive function of
up to 32 bytes):
1 channel
 UART mode:
1 channel