Overview Of Functions - NEC PD789860 User Manual

2.7 Overview of Functions

Part Number
Item
Internal memory ROM
High-speed RAM
EEPROM
Oscillator
Minimum instruction execution time
General-purpose registers
Instruction set
I/O ports
Timers
Power-on-clear POC circuit
circuit
LVI circuit
Bit sequential buffer
Key return function
Vectored interrupt Maskable
sources
Non-maskable
Power supply voltage
Operating ambient temperature
Package
34
µ
CHAPTER 2 GENERAL ( PD789861 SUBSERIES)
µ
PD789861
Mask ROM
4 KB
128 bytes
32 bytes
RC oscillator
µ
2.0/8.0 s (@1.0 MHz operation with system clock)
8 bits × 8 registers
• 16-bit operations
• Bit manipulations (such as set, reset, and test)
Total: 14
CMOS I/O: 10
CMOS input:
• 8-bit timer: 2 channels
• Watchdog timer: 1 channel
Generates internal reset signal according to comparison of detection voltage to
power supply voltage
Generates interrupt request signal according to comparison of detection voltage to
power supply voltage
8 bits + 8 bits = 16 bits
Generates key return signal according falling edge detection
Internal: 5
Internal: 1, external: 1
V = 1.8 to 3.6 V
DD
= −40 to +85°C
T
A
20-pin plastic SSOP (7.62 mm (300))
User's Manual U14826EJ5V0UD
EEPROM
4
µ
PD78E9861A