SN8P1829
8-Bit MCU build-in 12-bit ADC + PGIA + Charge-pump Reg 128 dots LCD driver
SONiX TECHNOLOGY CO., LTD
Page 58
Version 1.0
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
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
TC0C
TC0C7 TC0C6 TC0C5 TC0C4 TC0C3 TC0C2 TC0C1 TC0C0
R/W R/W R/W R/W R/W R/W R/W R/W
TC0 OVERFLOW TIME
TC0 rate is determinate by TC0Rate and Code Option TC0_Counter, TC0Rate can set TC0 clock frequency and
TC0_Counter set TC0 became 8-bit, 6-bit, 5-bit or 4-bit counter.
The equation of TC0C initial value is as following.
TC0C initial value = N
-
(TC0 interrupt interval time * input clock)
Which N is determinate by code option: TC0_Counter
TC0_Counter
N
Max. TC0C value
8-bit 256
255
6-bit 64
63
5-bit 32
31
4-bit 16
15
Note: TheTC0C must small or equal than Max. TC0 value.
Example: To set 10ms interval time for TC0 interrupt at F
OSC
= 3.58MHz.
TC0C value (74H) = 256 - (10ms * F
CPU
/64) (TC0RATE=010, TC0_Counter=8-bit, TC0X8=0)
TC0C initial value = 256 - (TC0 interrupt interval time * input clock)
= 256 - (10ms * 3.58 * 10
6
/ 4 / 64)
= 256 - (10
-2
* 3.58 * 10
6
/ 4 / 64)
= 116
= 74H
Example: To set 1.25ms interval time for TC0 interrupt at F
OSC
= 3.58MHz.
TC0C value (74H) = 256 - (10ms * F
CPU
/64) (TC0RATE=010, TC0_Counter=8-bit, TC0X8=1)
TC0C initial value = 256 - (TC0 interrupt interval time * input clock)
= 256 - (1.25ms * 3.58 * 10
6
/ 32)
= 256 - (0.00125 * 3.58 * 10
6
/ 32)
= 116
= 74H
Example: To set 1ms interval time for TC0 interrupt at F
OSC
= 3.58MHz.
TC0C value (32H) = 64 - (1ms * F
CPU
/64) (TC0RATE=010, TC0_COunter=6-bit, TC0X8=0)
TC0C initial value = 64 - (TC0 interrupt interval time * input clock)
= 64 - (1ms * 3.58 * 10
6
/ 4 / 64)
= 64 - (1
-2
* 3.58 * 10
6
/ 4 / 64)
= 64-14
= 32H
