10 Fine MODe 8-BiT TiMeRS (T8F)
S1C17624/604/622/602/621 TeChniCal Manual
Seiko epson Corporation
10-5
8.1 Delay Patterns Specified by TFMD[3:0]
Table 10.
TFMD[3:0]
underflow number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
0x0
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
0x1
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
D
0x2
–
–
–
–
–
–
–
D
–
–
–
–
–
–
–
D
0x3
–
–
–
–
–
–
–
D
–
–
–
D
–
–
–
D
0x4
–
–
–
D
–
–
–
D
–
–
–
D
–
–
–
D
0x5
–
–
–
D
–
–
–
D
–
–
–
D
–
D
–
D
0x6
–
–
–
D
–
D
–
D
–
–
–
D
–
D
–
D
0x7
–
–
–
D
–
D
–
D
–
D
–
D
–
D
–
D
0x8
–
D
–
D
–
D
–
D
–
D
–
D
–
D
–
D
0x9
–
D
–
D
–
D
–
D
–
D
–
D
–
D
D
D
0xa
–
D
–
D
–
D
D
D
–
D
–
D
–
D
D
D
0xb
–
D
–
D
–
D
D
D
–
D
D
D
–
D
D
D
0xc
–
D
D
D
–
D
D
D
–
D
D
D
–
D
D
D
0xd
–
D
D
D
–
D
D
D
–
D
D
D
D
D
D
D
0xe
–
D
D
D
D
D
D
D
–
D
D
D
D
D
D
D
0xf
–
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D: Indicates the insertion of a delay cycle.
Count clock
Underflow signal (not corrected)
Underflow signal (corrected)
Output clock (not corrected)
Output clock (corrected)
Delayed
15
16
15
16
1
1
8.1 Delay Cycle Insertion in Fine Mode
Figure 10.
At initial reset, TFMD[3:0] is set to 0x0, preventing insertion of delay cycles.
T8F interrupts
10.9
Each channel of the T8F module outputs an interrupt request to the interrupt controller (ITC) when the counter un-
derflows.
underflow interrupt
When the counter underflows, the interrupt flag T8FIF/T8F_INT
x
register, which is provided for each channel
in the T8F module, is set to 1. At the same time, an interrupt request is sent to the ITC if T8FIE/T8F_INT
x
reg-
ister has been set to 1 (interrupt enabled). An interrupt is generated if the ITC and S1C17 Core interrupt condi-
tions are satisfied.
If T8FIE is set to 0 (interrupt disabled, default), no interrupt request will be sent to the ITC.
For specific information on interrupt processing, see the “Interrupt Controller (ITC)” chapter.
notes: • The T8F module interrupt flag T8FIF must be reset in the interrupt handler routine after a T8F
interrupt has occurred to prevent recurring interrupts.
• Reset T8FIF before enabling T8F interrupts with T8FIE to prevent occurrence of unwanted in-
terrupt. T8FIF is reset by writing 1.