參數(shù)資料
型號: HD404629R
廠商: Hitachi,Ltd.
英文描述: AS Microcomputer Incorporating a DTMF Generator Circuit(微計(jì)算機(jī)帶雙音多頻發(fā)生器電路)
中文描述: 由于微機(jī)安裝有雙音多頻發(fā)電機(jī)斷路器(微計(jì)算機(jī)帶雙音多頻發(fā)生器電路)
文件頁數(shù): 60/155頁
文件大小: 549K
代理商: HD404629R
HD404629R Series
60
1/4
1/2
32.768-kHz
oscillator
System
clock
Prescaler W
(PSW)
Selector
Selector
Prescaler S (PSS)
S
I
Timer A interrupt
request flag
(IFTA)
Clock
Overflow
Timer
counter A
(TCA)
Timer mode
register A
(TMA)
3
2 f
1/2 tw
cyc
f
tw
cyc
PER
2
÷
4
÷
8
÷
3
÷
1
÷
5
÷
1
÷
2
÷
2
÷
8
÷
1
÷
3
÷
W
W
Data bus
Clock line
Signal line
Figure 43 Block Diagram of Timer A
Timer A Operations:
Free-running timer operation: The input clock for timer A is selected by timer mode register A (TMA:
$008).
Timer A is reset to $00 by MCU reset and
incremented at each input clock. If an input clock is applied to timer A after it has reached
$FF, an overflow is generated, and timer A is reset to $00. The overflow sets the timer A interrupt
request flag (IFTA: $001, bit 2). Timer A continues to be incremented after reset to $00, and therefore
it generates regular interrupts every 256 clocks.
Clock time-base operation: Timer A is used as a clock time-base by setting bit 3 (TMA3) of timer
mode register A (TMA: $008) to 1. The prescaler W output is applied to timer A, and timer A
generates interrupts at the correct timing based on the 32.768-kHz crystal oscillation. In this case,
prescaler W and timer A can be reset to $00 by software.
Registers for Timer A Operation:
Timer A operating modes are set by the following registers.
Timer mode register A (TMA: $008): Four-bit write-only register that selects timer A’s operating mode
and input clock source as shown in figure 44.
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