Clock Timer (Ct); Clock Timer Overview - Epson S1C17001 Technical Manual

15 Clock Timer (CT)

15.1 Clock Timer Overview

The S1C17001 incorporates a single-channel clock timer that uses the OSC1 clock as its oscillation source.
The clock timer consists of an 8-bit binary counter that uses the 256 Hz signal divided from the OSC1 clock as the
input clock and allows data for each bit (128 Hz to 1 Hz) to be read out by software.
The clock timer can also generate interrupts using the 32 Hz, 8 Hz, 2 Hz, and 1 Hz signals.
This clock timer is normally used for various timing functions, such as clocks.
Figure 15.1.1 illustrates the clock timer configuration.
OSC
OSC1 oscillator/
256Hz
division circuit
To ITC
S1C17001 TECHNICAL MANUAL
Timer reset CTRST
RUN/STOP
CTRUN
control
CTIE32
CTIE8
Interrupt enable
CTIE2
CTIE1
Clock timer interrupt request
Figure 15.1.1: Clock timer configuration
Count
D0 D1 D2
control
128 64 32
circuit
Hz Hz Hz
Interrupt
control
circuit
EPSON
15 CLOCK TIMER (TC)
Clock timer
CT_CNT
D3 D4 D5 D6 D7
16 8 4 2 1
Hz Hz Hz Hz Hz
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