UPD780957 Datasheet, PDF (33/326 Pages) NEC – 8-Bit Single-Chip Microcontrollers

CHAPTER 1 GENERAL
1.8 Overview of Functions
Part Number
µPD780957(A)
µPD780958(A)
Item
Internal memory ROM
48 KB
60 KB
High-speed RAM 1,024 bytes
Expansion RAM
1,024 bytes
General-purpose registers
8 bits × 32 registers (8 bits × 8 registers × 4 banks)
Minimum instruction execution time
Minimum instruction execution time variable function
1.7 µs/3.4 µs/6.7 µs (@ 1.2 MHz (RC oscillation) operation with main system clock)
61 µs (@ 32.768 kHz operation with subsystem clock 1)
Instruction set
• 16-bit operation
• Multiply/divide (8 bits × 8 bits, 16 bits ÷ 8 bits)
• Bit manipulation (set, reset, test, Boolean operation)
• BCD adjust, etc.
I/O ports
Total:
69
• CMOS I/O:
66
• N-ch open-drain I/O: 3 (3.6 V breakdown)
MR sampling function
MR sampling output/phase detection × 1 channel
(can also be used as one interval timer with 8-bit compare register)
Sampling function
Sampling output timer/detector × 1 channel
(can also be used as two interval timers with 8-bit compare register)
Serial interface
• UART mode (with pin switch function): 1 channel
• 3-wire serial I/O mode:
1 channel
Timer
• 16-bit timer/event counter:
• 8-bit timer:
• Watchdog timer:
2 channels
4 channels
1 channel
Timer output
1 output (or 3 outputs when the sampling output function and MR sampling function
are not used)
Clock output
256 Hz, 512 Hz, 1.024 kHz, 2.048 kHz, 4.096 kHz, 8.192 kHz, 16.384 kHz, 32.768 kHz
(@ 32.768 kHz operation with subsystem clock 1)
Real-time output
4 channels (4-bit × 4 buffers)
LCD controller/driver
30 segment signals × 3 common signals (static, 1/3 bias)
Vectored interrupt
sources
Maskable
Non-maskable
Internal: 17, external: 12
Internal: 1
Software
1
Power supply voltage
Operating ambient temperature
VDD = 2.2 to 3.5 V
TA = −40 to +80°C
Package
100-pin plastic LQFP (fine-pitch) (14 × 14)
User’s Manual U13655EJ2V1UD
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