12 8-BIT TIMER (T8F)
S1C17704 TECHNICAL MANUAL
EPSON
12-1
12 8-bit Timer (T8F)
12.1 Outline of the 8-bit Timer
The S1C17704 incorporates one channel of 8-bit timer with fine mode.
The 8-bit timer module includes an 8-bit presettable down counter and an 8-bit reload data register for setting the
preset value. The timer counts down from the initial value set in the reload data register and outputs an underflow
signal when the counter underflows. The underflow signal is used to generate an interrupt and the clock for UART.
The underflow period can be programmed by selecting a prescaler clock and setting reload data. This allows
the application program to get any desired time intervals and programmable serial transfer rates. The fine mode
provides a function to minimize transfer rate error.
Figure 12.1.1 shows the structure of the 8-bit timer.
Reload data register
T8F_TR
PRUN
DF[3:0]
PCLK•1/1–1/16K
Underflow
Run/stop control
Internal data bus
Fine mode setting
Interrupt request
Serial transfer clock
To ITC
To UART
Timer reset
Down counter
T8F_TC
Control circuit
PRESER
TFMD[3:0]
Prescaler
8-bit Timer
Count clock select
Figure 12.1.1 Structure of 8-bit Timer
Содержание S1C17704
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