12 8-BIT TIMER (T8F)
S1C17001 TECHNICAL MANUAL
EPSON
125
12 8-bit Timer (T8F)
12.1 8-bit Timer Overview
The S1C17001 incorporates an 8-bit timer with Fine mode.
The 8-bit timer consists of an 8-bit presettable down counter and an 8-bit reload data register holding the preset
values. 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 UART clock. The under-
flow cycle can be programmed by selecting the prescaler clock and reload data, enabling the application program to
obtain time intervals and serial transfer speeds as required. Fine mode provides a function that minimizes transfer
rate errors.
Figure 12.1.1 illustrates the 8-bit timer configuration.
Reload data register
T8F_TR
PRUN
DF[3:0]
PCLK
-
1/1 to 1/16 K
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 selection
Figure 12.1.1: 8-bit timer configuration
Содержание S1C17001
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Страница 91: ...9 PRESCALER PSC 82 EPSON S1C17001 TECHNICAL MANUAL This page intentionally left blank ...
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