S1C63454 TECHNICAL MANUAL
EPSON
59
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Programmable Timer)
4.10 Programmable Timer
4.10.1 Configuration of programmable timer
The S1C63454 has two 8-bit programmable timer systems (timer 0 and timer 1) built-in.
Timer 0 and timer 1 are composed of 8-bit presettable down counters and they can be used as 8-bit
×
2
channel programmable timers.
Figure 4.10.1.1 shows the configuration of the programmable timer.
The programmable timer is designed to count down from the initial value set in the counter with soft-
ware. An underflow according to the initial value occurs by counting down and is used for the following
functions:
• Presetting the initial value to the counter to generate the periodical underflow signal
• Generating an interrupt
• Generating a TOUT signal output from the R02 output port terminal
• Generating the synchronous clock source for the serial interface (timer 1 underflow is used, and it is
possible to set the transfer rate)
Reload data register
RLD00–RLD07
Data buffer
PTD00–PTD07
PTRUN0
FCSEL
PLPOL
Programmable timer 0
PTPS00
PTPS01
8-bit
down counter
Prescaler
Selector
CKSEL0
Timer 0 Run/Stop
Clock
control
circuit
Timer function setting
Pulse polarity setting
Prescaler
setting
Underflow
signal
Data buffer
PTD10–PTD17
Programmable timer 1
PTPS10
PTPS11
8-bit
down counter
Prescaler
Clock
control
circuit
Prescaler
setting
Underflow
signal
Data bus
Interrupt
request
CHSEL
TOUT (R02)
Serial interface
Selector
CKSEL1
Timer 1 Run/Stop
PTRST0
Timer 0 reset
PTRST1
Timer 1 reset
2,048
Hz
Divider
OSC3
oscillation
circuit
Interrupt
control
circuit
OSC1
oscillation
circuit
f
OSC3
f
OSC1
PTRUN1
1/2
PTOUT
Selector
Output port
R02
Reload data register
RLD10–RLD17
1/2
Fig. 4.10.1.1 Configuration of programmable timer
Содержание S1C63454
Страница 1: ...MF1074 03 Technical Manual CMOS 4 BIT SINGLE CHIP MICROCOMPUTER S1C63454 Technical Hardware S1C63454 ...
Страница 4: ......
Страница 6: ......
Страница 10: ......