Preliminary
SN8P1702A/SN8P1703A
8-bit micro-controller build-in 12-bit ADC
TC1C COUNTING REGISTER
TC1C is an 8-bit counter register for the timer counter (TC1). TC1C must be reset whenever the TC1ENB is set “1” to
start the timer. 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 TC1 interrupt service request (TC1IEN) enable condition, the TC1 interrupt request flag will be set
“1” and the system executes the interrupt service routine.
TC1C initial value = xxxx xxxx
0DDH
TC1C
Bit 7
TC1C7
R/W
Bit 6
TC1C6
R/W
Bit 5
TC1C5
R/W
Bit 4
TC1C4
R/W
Bit 3
TC1C3
R/W
Bit 2
TC1C2
R/W
Bit 1
TC1C1
R/W
Bit 0
TC1C0
R/W
TC1 Overflow Time
TC1 rate is determinate by TC1Rate and Code Option TC1_Counter, TC1Rate can set TC1 clock frequency from Fcpu
and TC1_Counter set TC1 became 8-bit, 6-bit, 5-bit or 4-bit counter.
The equation of TC1C initial value is as following.
TC1C initial value = N - (TC1 interrupt interval time * input clock)
Which N is determinate by code option: TC1_Counter
TC1_Counter
8-bit
N
256
64
Max. TC1C value
255
63
6-bit
5-bit
32
31
4-bit
16
15
ꢀ
Note: TheTC1C must small or equal than Max. TC1 value.
ꢁExample: To set 10ms interval time for TC1 interrupt at Fosc = 3.58MHz
TC1C value (74H) = 256 - (10ms * fcpu/64) (TC1RATE=010, TC1_Counter=8-bit, TC1X8=0)
TC1C initial value = 256 - (TC0 interrupt interval time * input clock)
= 256 - (10ms * 3.58 * 106 / 4 / 64)
= 256 - (0.01 * 3.58 * 106 / 4 / 64)
= 116
= 74H
ꢁExample: To set 1.25ms interval time for TC1 interrupt at Fosc = 3.58MHz
TC1C value (74H) = 256 - (10ms * fcpu/64) (TC1RATE=010, TC1_Counter=8-bit, TC1X8=1)
TC1C initial value = 256 - (TC0 interrupt interval time * input clock)
= 256 - (1.25ms * 3.58 * 106 / 32)
= 256 - (0.00125 * 3.58 * 106 / 32)
= 116
= 74H
ꢁExample: To set 1ms interval time for TC1 interrupt at Fosc = 3.58MHz
TC1C value (32H) = 64 - (1ms * fcpu/64) (TC1RATE=010, TC1_COunter=6-bit, TC1X8=0)
TC1C initial value = 64 - (TC0 interrupt interval time * input clock)
= 64 - (1ms * 3.58 * 106 / 4 / 64)
= 64 - (0.001 * 3.58 * 106 / 4 / 64)
= 64 - 14
= 32H
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