參數(shù)資料
型號: GMS87C7216LQ
廠商: Electronic Theatre Controls, Inc.
元件分類: 數(shù)學(xué)處理器
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): 52/121頁
文件大?。?/td> 1645K
代理商: GMS87C7216LQ
GMS81C7208/7216
48
FEB. 2005 Ver 1.04
8-bit Event Counter Mode
In this mode, counting up is started by an external trigger. This
trigger means rising edge of the EC0 or EC2 pin input. Source
clock is used as an internal clock selected with timer mode regis-
ter TM0, TM1, TM2 or TM3. The contents of timer data register
TDR
n
(n = 0,1,2,3,........,FF) are compared with the contents of
the up-counter T
n
. If a match is found, an timer interrupt request
flag T
n
IF is generated, and the counter is cleared to “0”. The
counter is restart and count up continuously by every rising edge
of the EC
n
pin input.
The maximum frequency applied to the EC
n
pin is f
XIN
/2 [Hz].
In order to use event counter function, the bit 3, 4 of the Port
Mode Register PMR (address 0D9
H
) is required to be set to “1”.
After reset, the value of timer data register TDR
n
is undefined, it
should be initialized to between 01
H
~FF
H
,
not to "0". The inter-
val period of Timer is calculated as below equation.
Figure 13-7 Event Counter Mode Timing Chart
Figure 13-8 Count Operation of Timer / Event Counter
Period (sec)
f
XIN
--1
2
Divide Ratio
TDRn
×
×
×
=
0
1
2
1
0
n
2
~
~
~
n-1
n
~
~
~
EC
n
pin input
Up-counter
TDR1
T1IF interrupt
Start count
Timer 1 (T1IF)
Interrupt
TDR1
TIME
Occur interrupt
Occur interrupt
stop
clear & start
disable
enable
Start & Stop
T1ST
T1CN
Control count
upcoun
~
~
~
~
T1ST = 0
T1ST = 1
T1CN = 0
T1CN = 1
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