參數(shù)資料
型號: S1C63406F
元件分類: 微控制器/微處理器
英文描述: 4-BIT, MROM, 4.2 MHz, MICROCONTROLLER, PQFP128
封裝: PLASTIC, TQFP15-128
文件頁數(shù): 89/144頁
文件大小: 1160K
代理商: S1C63406F
S1C63406 TECHNICAL MANUAL
EPSON
41
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (I/O Ports)
PPL20–PPL23: P2 port pull-up control register (FF49H)
The pull-up during the input mode are set with these registers.
When "1" is written: pull-up ON
When "0" is written: pull-up OFF
Reading: Valid
The built-in pull-up resistor which is turned ON during input mode is set to enable in 1-bit units.
By writing "1" to the pull-up control register, the corresponding I/O ports are pulled up (during input
mode), while writing "0" turns the pull-up function OFF.
At initial reset, these registers are all set to "1", so the pull-up function is set to ON.
The pull-up control registers of the ports that are set as output for the serial interface can be used as
general purpose registers that do not affect the pull-up control.
The pull-up control registers of the port that are set as input for the serial interface function the same as
the I/O port.
4.6.6 Programming note
When in the input mode, I/O ports are changed from low to high by pull-up resistor, the rise of the
waveform is delayed on account of the time constant of the pull-up resistor and input gate capacitance.
Hence, when fetching input ports, set an appropriate wait time.
Particular care needs to be taken of the key scan during key matrix configuration.
Make this waiting time the amount of time or more calculated by the following expression.
10
× C × R
C: terminal capacitance 5 pF + parasitic capacitance ? pF
R: pull-up resistance 300 k
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