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GMS81C2012 датащи(PDF) 52 Page - Hynix Semiconductor

номер детали GMS81C2012
подробное описание детали  HYUNDAI MICRO ELECTRONICS 8-BIT SINGLE-CHIP MICROCONTROLLERS
PDF  107 Pages
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производитель  HYNIX [Hynix Semiconductor]
домашняя страница  http://www.skhynix.com/kor/main.do
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GMS81C2012 датащи(HTML) 52 Page - Hynix Semiconductor

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GMS81C2012/GMS81C2020
HYUNDAI MicroElectronics
52
MAR. 2000 Ver 1.00
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 in-
put. The contents of TDRn are compared with the contents
of up-counter, Tn. 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 TDRn is changeable by software, time in-
terval is set as you want
Figure 12-3 Timer Mode Timing Chart
Figure 12-4 Timer Count Example
0
n-2
2
0
n
3
n-1
n
Source clock
Up-counter
TDR1
T1IF interrupt
Start count
1
23
1
4
Match
Detect
Counter
Clear
Timer 1 (T1IF)
Interrupt
TDR1
TIME
Occur interrupt
Occur interrupt
Occur interrupt
Interrupt period
0
1
2
3
4
5
6
7A
7D
7C
Count Pulse
= 8
µs x 125
7B
MATCH
Example: Make 2ms
interrupt using by Timer0 at 4MHz
LDM
TM0,#0FH
; divide by 32
LDM
TDR0,#125
; 8us x 125= 1ms
SET1
T0E
; Enable Timer 0 Interrupt
EI
; Enable Master Interrupt
Period
When
TDR0 = 125D = 7DH
fXIN = 4 MHz
INTERRUPT PERIOD =
4
× 106 Hz
1
× 32 × 125 = 1 ms
TM0 = 0000 1111B (8-bit Timer mode, Prescaler divide ratio = 32)
8
µs
(TDR0 = T0)
7D
0



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