UPD780957(A) Features
78K/0 Series (8-bit CPU core)
Main system clock: RC oscillation
Minimum instruction execution time: 1.7 µs (@ 1.2 MHz operation with main system clock)
61 µs (@ 32.768 kHz operation with subsystem clock 1)
Instruction set suited to system control
Interrupt controller
• Vectored interrupt servicing
Standby function
• HALT mode
Internal memory: Mask ROM 48 KB (µPD780957(A))
60 KB (µPD780958(A))
RAM 2,048 bytes (µPD780957(A), 780958(A))
I/O ports (including pins that have an alternate function as segment signal outputs): 69
• Software programmable pull-up ports: 66
• Mask option pull-up ports: 3
LCD controller/driver
Real-time output function: 4-bit resolution × 4 channels
MR sampling function: 1 channel (can be used as an 8-bit timer when MR sampling function is not used)
Timer: 7 channels
• 16-bit timer/event counter: 2 channels
• 8-bit timer: 4 channels
• Watchdog timer: 1 channel
Serial interface: 2 channels
• UART mode (with pin switching function): 1 channel (communication is possible with subsystem clock 1 or 2)
• 3-wire serial I/O mode: 1 channel
Sampling output timer/detector: 1 channel
(can be used as a 2-channel 8-bit timer when sampling output timer/detector is not used)
Power supply voltage: VDD = 2.2 to 3.5 V
UPD780957(A) Typical Application
Industrial meter control, etc.
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