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參數(shù)資料
| 型號(hào)： | S1C63458F0A0100 |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | MICROCONTROLLER, PQFP144 |
| 封裝： | QFP-144 |
| 文件頁(yè)數(shù)： | 97/144頁(yè) |
| 文件大小： | 1156K |
| 代理商： | S1C63458F0A0100 |
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46
EPSON
S1C63458 TECHNICAL MANUAL
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (I/O Ports)
PUL00–PUL03: P0 port pull-up control register (FF41H)
PUL10–PUL13: P1 port pull-up control register (FF45H)
PUL20–PUL23: 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. (The
pull-up resistor is included into the ports selected by the mask option.)
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 in which the pull-up resistor is not included become the general
purpose register. The registers of the ports that are set as special output or output for the serial interface
can also 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.
4.6.7 Programming notes
(1) 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 capaci-
tance. 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 330 k
(2) When special output (CL, FR) has been selected, a hazard may occur when the signal is turned ON or
OFF.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| S1C63466D | 4-BIT, MROM, 4.1 MHz, MICROCONTROLLER, UUC140 |
| S1C63466F | 4-BIT, MROM, 4.1 MHz, MICROCONTROLLER, PQFP144 |
| S1C63567F0A0100 | MICROCONTROLLER, PQFP144 |
| S1C63653F | 4-BIT, FLASH, 4 MHz, MICROCONTROLLER, CQFP100 |
| S1C6F567D0A0100 | MICROCONTROLLER, UUC141 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| S1C63557D04Q000 | 制造商:Seiko Instruments Inc (SII) 功能描述:EPSON MCU 4BIT |
| S1C63567 | 制造商:EPSON 制造商全稱:EPSON 功能描述:4-bit Single Chip Microcomputer |
| S1C63616 | 制造商:EPSON 制造商全稱:EPSON 功能描述:4-bit Single Chip Microcomputer |
| S1C63632 | 制造商:EPSON 制造商全稱:EPSON 功能描述:4-bit Single Chip Microcomputer |
| S1C63653 | 制造商:EPSON 制造商全稱:EPSON 功能描述:CMOS 4-bit Single Chip Microcontroller |
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