12 8-BIT TIMER (T8F)
S1C17704 TECHNICAL MANUAL
EPSON
12-7
12.7 8-bit Timer Output Signal
The 8-bit timer outputs an underflow pulse when the counter underflows.
This pulse is used to request a timer interrupt.
Underflow signal
Timer output
(serial transfer clock)
Interrupt request to the ITC
Figure 12.7.1 Timer Output Clock
Also this pulse is used to generate a serial transfer clock and the clock is sent to the UART.
The reload data register value to obtain a desired transfer rate is calculated by the expression below.
clk_in
bps = —————————————
{( 1)
×
16 + TFMD}
clk_in
T8F_TR =
(
——— - TFMD - 16
)
÷
16
bps
clk_in:
Count clock (prescaler output clock) frequency [Hz]
T8F_TR: Reload data (0–255)
bps: Transfer
rate
(bits/second)
TFMD: Fine mode setting value (0–15)
Содержание S1C17704
Страница 1: ...TECHNICAL MANUAL S1C17704 CMOS 16 BIT SINGLE CHIP MICROCOMPUTER ...
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