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參數(shù)資料
| 型號： | HD40A4358S |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | 4-bit HMCS400-Series microcomputer |
| 中文描述： | 4位HMCS400系列微機(jī) |
| 文件頁數(shù)： | 44/100頁 |
| 文件大小： | 398K |
| 代理商： | HD40A4358S |
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HD404358 Series
44
Timer A
Timer A Functions:
Timer A has the following functions.
Free-running timer
The block diagram of timer A is shown in figure 29.
System
clock
Selector
Prescaler S (PSS)
I
Timer A interrupt
request flag
(IFTA)
Overflow
Timer
counter A
(TCA)
Timer mode
register A
(TMA)
3
PER
2
÷
4
÷
8
÷
3
÷
1
÷
5
÷
1
÷
2
÷
Clock
Figure 29 Timer A Block Diagram
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.
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 30.
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