UPD789121中文資料瑞薩數據手冊PDF規(guī)格書

FEATURES

· On-chip multiplier: 8 bits ′ 8 bits = 16 bits

· ROM and RAM sizes

· Built-in RC oscillator

· Minimum instruction execution time can be changed from high-speed (0.5 ms) to low-speed (2.0 ms) (@ 4.0-MHz

operation with system clock)

· I/O ports: 20

· Serial interface: 1 channel: Switchable between 3-wire serial I/O and UART modes

· 8-bit resolution A/D converter: 4 channels (mPD789121, 789122, 789124)

· 10-bit resolution A/D converter: 4 channels (mPD789131, 789132, 789134)

· Timers: 3 channels

· 16-bit timer: 1 channel

· 8-bit timer/event counter: 1 channel

· Watchdog timer: 1 channel

· Power supply voltage: VDD = 2.7 to 5.5 V