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15 Clock Timer (CT)
15-10
Seiko Epson Corporation
S1C17601 TECHNICAL MANUAL
0x5003: Clock Timer Interrupt Flag Register (CT_IFLG)
Register name Address
Bit
Name
Function
Setting
Init. R/W
Remarks
Clock Timer
Interrupt Flag
Register
(CT_IFLG)
0x5003
(8 bits)
D7–4
–
reserved
–
0 when being read.
D3
CTIF32
32 Hz interrupt flag
1 Cause of
interrupt
occurred
0 Cause of
interrupt not
occurred
0
R/W Reset by writing 1.
D2
CTIF8
8 Hz interrupt flag
0
R/W
D1
CTIF2
2 Hz interrupt flag
0
R/W
D0
CTIF1
1 Hz interrupt flag
0
R/W
This register indicates the occurrence state of interrupt factors due to clock timer 32 Hz, 8 Hz, 2 Hz, and 1 Hz
signals. If a clock timer interrupt occurs, identify the interrupt factor (frequency) by reading the interrupt flag in
this register. CTIF* are CT module interrupt flags corresponding to the individual 32 Hz, 8 Hz, 2 Hz, and 1 Hz
interrupts. It is set to 1 at the falling edge of each signal if CTIE* (CT_IMSK register) is set to 1. The clock timer
interrupt request signal is output to the ITC at the same time. This interrupt request signal generates an interrupt if
the ITC and S1C17 core interrupt conditions are met.
CTIF* is reset by writing as 1.
Note: To prevent interrupt recurrences, the CT module interrupt flag CTIFmust be reset within the
interrupt processing routine following a clock timer interrupt.
To prevent generating unnecessary interrupts, CTIF must be reset before permitting clock
timer interrupts using CTIE.
D[7:4]
Reserved
D3
CTIF32: 32 Hz Interrupt Flag
Interrupt flag indicating the 32 Hz interrupt factor occurrence status.
1(R):
Interrupt factor present
0(R):
No interrupt factor (default)
1(W):
Reset flag
0(W):
Disabled
Setting CTIE32 (D3/CT_IMSK register) to 1 sets CTIF32 to 1 at the 32 Hz signal falling edge.
D2
CTIF8: 8 Hz Interrupt Flag
Interrupt flag indicating the 8 Hz interrupt factor occurrence status.
1(R):
Interrupt factor present
0(R):
No interrupt factor (default)
1(W):
Reset flag
0(W):
Disabled
Setting CTIE8 (D2/CT_IMSK register) to 1 sets CTIF8 to 1 at the 8 Hz signal falling edge.
D1
CTIF2: 2 Hz Interrupt Flag
Interrupt flag indicating the 2 Hz interrupt factor occurrence status.
1(R):
Interrupt factor present
0(R):
No interrupt factor (default)
1(W):
Reset flag
0(W):
Disabled
Setting CTIE2 (D1/CT_IMSK register) to 1 sets CTIF2 to 1 at the 2 Hz signal falling edge.
D0
CTIF1: 1 Hz Interrupt Flag
Interrupt flag indicating the 1 Hz interrupt factor occurrence status.
1(R):
Interrupt factor present
0(R):
No interrupt factor (default)
1(W):
Reset flag
0(W):
Disabled
Setting CTIE1 (D0/CT_IMSK register) to 1 sets CTIF1 to 1 at the 1 Hz signal falling edge.