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參數(shù)資料
| 型號(hào)： | S1C63455F |
| 元件分類(lèi)： | 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(yè)數(shù)： | 79/119頁(yè) |
| 文件大?。?/td> | 865K |
| 代理商： | S1C63455F |
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54
EPSON
S1C63455 TECHNICAL MANUAL
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Stopwatch Timer)
When data of the counter is read at run mode, proper reading may not be obtained due to the carry from
low-order digits (SWD0–SWD3) into high-order digits (SWD4–SWD7) (i.e., in case SWD0–SWD3 and
SWD4–SWD7 reading span the timing of the carry). To avoid this occurrence, perform the reading after
suspending the counter once and then set the SWRUN to "1" again.
Moreover, it is required that the suspension period not exceed 976 sec (1/4 cycle of 256 Hz).
At initial reset, this register is set to "0".
EISW10: 10Hz interrupt mask register (FFE7HD0)
EISW1:
1Hz interrupt mask register (FFE7HD1)
These registers are used to select whether to mask the stopwatch timer interrupt.
When "1" is written: Enabled
When "0" is written: Masked
Reading: Valid
The interrupt mask registers (EISW10, EISW1) are used to select whether to mask the interrupt to the
separate frequencies (10 Hz, 1 Hz).
At initial reset, these registers are set to "0".
ISW10: 10 Hz interrupt factor flag (FFF7HD0)
ISW1:
1 Hz interrupt factor flag (FFF7HD1)
These flags indicate the status of the stopwatch timer 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 flags ISW10 and ISW1 correspond to 10 Hz and 1 Hz stopwatch timer interrupts,
respectively. The software can judge from these flags whether there is a stopwatch timer interrupt.
However, even if the interrupt is masked, the flags are set to "1" by the overflow of the corresponding
counters.
These flags are reset to "0" by writing "1" to them.
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, these flags are set to "0".
4.9.5 Programming notes
(1) When data of the counter is read at run mode, perform the reading after suspending the counter once
and then set SWRUN to "1" again. Moreover, it is required that the suspension period not exceed 976
sec (1/4 cycle of 256 Hz).
(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.
(3) When the CR oscillation circuit is selected as the OSC1 oscillation circuit by mask option, the frequen-
cies and times differ from the values described in this section because the oscillation frequency will be
60 kHz (Typ.). Therefore, this timer can not be used for the stopwatch function.
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