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參數(shù)資料
| 型號： | S1C63455F |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, MROM, 4.1 MHz, MICROCONTROLLER, PQFP128 |
| 封裝： | PLASTIC, QFP5-128 |
| 文件頁數(shù)： | 52/119頁 |
| 文件大?。?/td> | 865K |
| 代理商： | S1C63455F |
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30
EPSON
S1C63455 TECHNICAL MANUAL
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Input Ports)
For KCP00–KCP03, a comparison is done only with the ports that are enabled by the interrupt among
K00–K03 by means of the SIK00–SIK03 registers.
At initial reset, these registers are set to "0".
EIK0: K0 input interrupt mask register (FFE4HD0)
Masking the interrupt of the input port can be selected with this register.
When "1" is written: Enable
When "0" is written: Mask
Reading: Valid
At initial reset, this register is set to "0".
IK0: K0 input interrupt factor flag (FFF4HD0)
This flag indicates the occurrence of input interrupt.
When "1" is read: Interrupt has occurred
When "0" is read: Interrupt has not occurred
When "1" is written: Flag is reset
When "0" is written: Invalid
The interrupt factor flag IK0 is associated with K00–K03. From the status of this flag, the software can
decide whether an input interrupt has occurred.
The interrupt factor flag is set to "1" when the interrupt condition is established regardless of the interrupt
mask register setting. However, the interrupt does not occur to the CPU when the interrupt is masked.
This flag is reset to "0" by writing "1".
After an interrupt occurs, the same interrupt will occur again if the interrupt enabled state (I flag = "1") is
set or the RETI instruction is executed unless the interrupt factor flag is reset. Therefore, be sure to reset
(write "1" to) the interrupt factor flag in the interrupt service routine before shifting to the interrupt
enabled state.
At initial reset, this flag is set to "0".
4.4.5 Programming notes
(1) When input ports are changed from low to high by pull-up resistors, 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 waiting 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) After an interrupt occurs, the same interrupt will occur again if the interrupt enabled state (I flag =
"1") is set or the RETI instruction is executed unless the interrupt factor flag is reset. Therefore, be sure
to reset (write "1" to) the interrupt factor flag in the interrupt service routine before shifting to the
interrupt enabled state.
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