Specifications

S1C6S2N7 TECHNICAL HARDWARE EPSON I-45
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Clock Timer)
Clock Timer
The S1C6S2N7 Series has a built-in clock timer driven by
the source oscillator. The clock timer is configured as a
seven-bit binary counter that serves as a frequency divider
taking a 256 Hz source clock from the oscillation circuit.
The four high-order bits (16 Hz–2 Hz) can be read by the
software.
The frequencies described in this section, such as timer data
and interrupt signals, are the values when the OSC
oscillation frequency is 32.768 kHz. When CR oscillator
(typ. 65 kHz) is used as the OSC oscillation circuit, each
timer frequency becomes "CR oscillation frequency/32,768".
In the S1C6S2A7, the clock timer cannot be used.
Figure 4.7.1 is the block diagram of the clock timer.
4.7
Configuration of
clock timer
Normally, this clock timer is used for all kinds of timing
purpose, such as clocks.
Fig. 4.7.1
Block diagram of
clock timer
128 Hz–32 Hz
Data bus
32 Hz, 8 Hz, 2 Hz
256 Hz
Clock timer reset signal
OSC
(oscillation circuit)
Interrupt
request
Interrupt
control
16 Hz–2 Hz