SN8P1700
8-bit micro-controller build-in 12-bit ADC
TC0C COUNTING REGISTER
TC0C is an 8-bit counter register for the timer counter (TC0). TC0C must be reset whenever the TC0ENB is set “1” to
start the timer counter. TC0C is incremented by one with a clock pulse which the frequency is determined by
TC0RATE0 ~ TC0RATE2. When TC0C has incremented to “0FFH”, it is will be cleared to “00H” in next clock and an
overflow is generated. Under TC0 interrupt service request (TC0IEN) enable condition, the TC0 interrupt request flag
will be set “1” and the system executes the interrupt service routine.
TC0C initial value = xxxx xxxx
0DBH
TC0C
Bit 7
TC0C7
R/W
Bit 6
TC0C6
R/W
Bit 5
TC0C5
R/W
Bit 4
TC0C4
R/W
Bit 3
TC0C3
R/W
Bit 2
TC0C2
R/W
Bit 1
TC0C1
R/W
Bit 0
TC0C0
R/W
High speed mode (fcpu = 3.58MHz / 4)
Max overflow interval One step = max/256 Max overflow interval One step = max/256
Low speed mode (fcpu = 32768Hz / 4)
TC0RATE TC0CLOCK
000
001
010
011
100
101
110
111
fcpu/256
fcpu/128
fcpu/64
fcpu/32
fcpu/16
fcpu/8
73.2 ms
36.6 ms
18.3 ms
9.15 ms
4.57 ms
2.28 ms
1.14 ms
0.57 ms
286us
143us
71.5us
35.8us
17.9us
8.94us
4.47us
2.23us
8000 ms
4000 ms
2000 ms
1000 ms
500 ms
250 ms
125 ms
62.5 ms
31.25 ms
15.63 ms
7.8 ms
3.9 ms
1.95 ms
0.98 ms
0.49 ms
0.24 ms
fcpu/4
fcpu/2
Table 8-1. The Timing Table of Timer Count TC0
The equation of TC0C initial value is as following.
TC0C initial value = 256 - (TC0 interrupt interval time * input clock)
ꢃExample: To set 10ms interval time for TC0 interrupt at 3.58MHz high-speed mode. TC0C value (74H) = 256 -
(10ms * fcpu/64)
TC0C initial value = 256 - (TC0 interrupt interval time * input clock)
= 256 - (10ms * 3.58 * 106 / 4 / 64)
= 256 - (10-2 * 3.58 * 106 / 4 / 64)
= 116
= 74H
SONiX TECHNOLOGY CO., LTD
Page 74
Revision 1.94
SONIX [ SONIX TECHNOLOGY COMPANY ]
