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參數(shù)資料
| 型號： | HD404324 |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | 4-bit HMCS400-series microcomputer(4位單片微計算機(jī)) |
| 中文描述： | 4位HMCS400系列微電腦（4位單片微計算機(jī)） |
| 文件頁數(shù)： | 47/94頁 |
| 文件大小： | 573K |
| 代理商： | HD404324 |
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HD404328 Series
47
Timer C (TCCL and TCRL: $00A, TCCU and TCRU: $00B):
Eight-bit write-only timer load register
(TCRL and TCRU) and read-only timer counter (TCCL and TCCU) located at the same addresses. The
eight-bit configuration consists of lower and upper digits located at sequential addresses. The operation of
timer C is basically the same as that of timer B. A block diagram of timer C is shown in figure 28.
The auto-reload function and prescaler division ratio of timer C depend on the state of timer mode register
C (TMC). Timer C is initialized to the value set in TMC by software, then is incremented by one at each
clock input. If an input is applied to timer C after it has reached $FF, an overflow is generated. In this
case, if the auto-reload function is enabled, timer C is initialized to its initial value; if auto-reload is
disabled, the timer is initialized to $00. The overflow sets the timer C interrupt request flag (IFTC: $002,
bit 2).
Timer C also functions as a watchdog timer. If a program routine runs out of control and an overflow is
generated while the watchdog on (WDON) flag is set, the MCU is reset. This error can be detected by
having the program control timer C reset before timer C reaches $FF.
The WDON can only have 1 written to it; it is cleared to 0 only by MCU reset.
Timer/counter C
(TCC)
÷
÷
÷
÷
÷
÷
÷
÷
2
4
8
3
1
5
1
2
Selector
System
clock
PER
Prescaler S (PSS)
3
Timer load
register C lower
(TCRL)
Timer mode
register C (TMC)
Timer load
register C upper
(TCRU)
Clock
Free-running/
reload timer
control signal
Timer latch
register C
(TLC)
Interrupt request
flag of timer C
(IFTC)
Overflow
Watchdog timer
controller
Watchdog on
flag (WDON)
System reset signal
I
Figure 28 Timer C Block Diagram
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| HD404324FS | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:microcomputer designed to increase program productivity |
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