SN8P2624
8-Bit Micro-Controller
SONiX TECHNOLOGY CO., LTD Page 73 Version 0.3
8.2 TIMER 0 (T0)
8.2.1 OVERVIEW
The T0 is an 8-bit binary up timer and event counter. If T0 timer occurs an overflow (from FFH to 00H), it will continue
counting and issue a time-out signal to trigger T0 interrupt to request interrupt service.
The main purposes of the T0 timer is as following.
) 8-bit programmable up counting timer: Generates interrupts at specific time intervals based on the selected
clock frequency.
) Green mode wakeup function: T0 can be green mode wake-up time as T0ENB = 1. System will be wake-up by
T0 time out.
Fcpu
T0 Rate
(Fcpu/2~Fcpu/256)
T0ENB
CPUM0,1
T0C 8-Bit Binary Up Counting Counter T0 Time Out
Load
Internal Data Bus
8.2.2 T0M MODE REGISTER
0D8H Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
T0M
T0ENB T0rate2 T0rate1 T0rate0 - - - -
Read/Write R/W R/W R/W R/W - - - -
After reset 0 0 0 0 - - - -
Bit [6:4] T0RATE[2:0]: T0 internal clock select bits.
000 = fcpu/256.
001 = fcpu/128.
…
110 = fcpu/4.
111 = fcpu/2.
Bit 7 T0ENB: T0 counter control bit.
0 = Disable T0 timer.
1 = Enable T0 timer.
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