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參數(shù)資料
| 型號(hào)： | 68HC705PL4B |
| 廠商： | Motorola, Inc. |
| 英文描述： | 8-Bit Microcontroller Units (MCU).(8位微控制器) |
| 中文描述： | 8位微控制器單元（MCU）。（8位微控制器） |
| 文件頁(yè)數(shù)： | 63/98頁(yè) |
| 文件大?。?/td> | 1019K |
| 代理商： | 68HC705PL4B |
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April 30, 1998
GENERAL RELEASE SPECIFICATION
MC68HC05PL4
REV 2.0
8-BIT TIMER
MOTOROLA
10-1
SECTION 10
8-BIT TIMER
This section describes the 8-bit count down timer module.
10.1
OVERVIEW
Figure 10-1. Timer8 Block Diagram
As shown in
Figure 10-1
this timer contains a single 8-bit software programmable
countdown timer counter with a 3-bit software control prescaler. The counter’s
value may be preset under software control and counts down to zero. When the
counter decrements to zero, the timer8 interrupt request bit (T8IF in T8CR) is set.
Then if the timer interrupt is enabled (T8IE in T8CR is set) and the I-bit of the con-
dition code register are is cleared, the processor receives an interrupt. After com-
pletion of the current instruction, the processor proceeds to store the appropriate
registers on the stack and then fetches the timer8 interrupt vector in order to begin
serving the interrupt.
Interrupt Circuit
Timer8 Counter Register ($0E)
T8IF T8IFR T8IE
T8EN PS2
PS1
PS0
Timer8 Control and Status Register ($0D)
Overflow
Detect
Circuit
8-bit count-down timer counter
7-bit prescaler counter
Prescaler
Select
Logic
(8 to 1 MUX)
I
8
8
8
8
Internal
Bus Clock
To COP
Watchdog
Circuit
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