參數資料
型號： S1C63158D0A010P
元件分類： 微控制器/微處理器
英文描述： 4-BIT, FLASH, 4 MHz, MICROCONTROLLER, UUC53
封裝： DIE-53
文件頁數： 112/159頁
文件大?。?/td> 1200K
代理商： S1C63158D0A010P
48
EPSON
S1C63808 TECHNICAL MANUAL
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Clock Timer)
EIT0: 32 Hz interrupt mask register (FFE6HD0)
EIT1: 8 Hz interrupt mask register (FFE6HD1)
EIT2: 2 Hz interrupt mask register (FFE6HD2)
EIT3: 1 Hz interrupt mask register (FFE6HD3)
These registers are used to select whether to mask the clock timer interrupt.
When "1" is written: Enabled
When "0" is written: Masked
Reading: Valid
The interrupt mask registers (EIT0, EIT1, EIT2, EIT3) are used to select whether to mask the interrupt to
the separate frequencies (32 Hz, 8 Hz, 2 Hz, 1 Hz).
At initial reset, these registers are set to "0".
IT0: 32 Hz interrupt factor flag (FFF6HD0)
IT1: 8 Hz interrupt factor flag (FFF6HD1)
IT2: 2 Hz interrupt factor flag (FFF6HD2)
IT3: 1 Hz interrupt factor flag (FFF6HD3)
These flags indicate the status of the clock 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 (IT0, IT1, IT2, IT3) correspond to the clock timer interrupts of the respective
frequencies (32 Hz, 8 Hz, 2 Hz, 1 Hz). The software can judge from these flags whether there is a clock
timer interrupt. However, even if the interrupt is masked, the flags are set to "1" at the falling edge of the
signal.
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".
4.7.5 Programming notes
(1) Be sure to read timer data in the order of low-order data (TM0–TM3) then high-order data (TM4–
TM7).
(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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