參數(shù)資料
型號： GMS87C7216Q
廠商： Electronic Theatre Controls, Inc.
元件分類： 8位微控制器
英文描述： 8-BIT SINGLE-CHIP MICROCONTROLLERS
中文描述： 8位單晶片微控制器
文件頁數(shù)： 51/121頁
文件大?。?/td> 1645K
代理商： GMS87C7216Q
GMS81C7208/7216
FEB. 2005 Ver 1.04
47
8-bit Timer Mode
In the timer mode, the internal clock is used for counting up.
Thus, you can think of it as counting internal clock input. The
contents of TDR
n
(n=0,1,2,3) are compared with the contents of
up-counter, T
n
(n=0,1,2,3). If match is found, a timer 1 interrupt
(T1IF) is generated and the up-counter is cleared to 0. Counting
up is resumed after the up-counter is cleared.
As the value of TDR
n
can be re-written by software, time interval
is set as you want
.
Figure 13-5 Timer Mode Timing Chart
Figure 13-6 Timer Count Example
0
n-2
2
0
n
3
n-1
n
Source clock
Up-counter
TDR1
T1IF interrupt
Start count
1
2
3
1
4
Match
Detect
Counter
Clear
~
~
~
~
~
~
Timer 1 (T1IF)
Interrupt
TDR1
TIME
Occur interrupt
Occur interrupt
Occur interrupt
Interrupt period
= 8
μ
s x 125
upcoun
~
~
0
1
2
3
4
5
6
7A
7D
7C
Count Pulse
Period
7B
MATCH
(TDR0 = T0)
Example:
Make 1ms
interrupt using by Timer0 at 4MHz
LDM
LDM
SET1
EI
TM0,#0FH
TDR0,#124
T0E
; divide by 32
; 8us x (124+1)= 1ms
; Enable Timer 0 Interrupt
; Enable Master Interrupt
When
TDR0 = 124
D
= 7C
H
f
XIN
= 4 MHz
INTERRUPT PERIOD =
4
×
10
6
Hz
1
×
32
×
(124+1) = 1 ms
TM0 = 0000_1111
B
(8-bit Timer mode, Prescaler divide ratio
→
÷
32)
8
μ
s
7D
0
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