8-Bit Timer Output Signal - Epson S1C17001 Technical Manual

12.7 8-bit Timer Output Signal

The 8-bit timer outputs underflow pulses when the counter underflows.
These pulses are used for timer interrupt requests.
Underflow signal
Timer output
(serial transfer clock)
Interrupt request to ITC
The underflow pulses are also used to generate the serial transfer clock and are transmitted to the UART.
Use the following equations to calculate the reload data register value for obtaining the desired transfer rate.
clk_in
bps = —————————————
{(T8F_TR + 1) × 16 + TFMD}
( clk_in
T8F_TR = ——— - TFMD - 16
bps
clk_in: Count clock (prescaler output clock) frequency [Hz]
T8F_TR: Reload data (0 to 255)
bps: Transfer rate (bit/s)
TFMD: Fine mode setting (0 to15)
S1C17001 TECHNICAL MANUAL
Figure 12.7.1: Timer output clock
)
÷ 16
EPSON
12 8-BIT TIMER (T8F)
131