參數(shù)資料
型號: T48C893-TK
廠商: ATMEL CORP
元件分類: 微控制器/微處理器
英文描述: The multiple times programmable (MTP) version for the MARC4 ROM types
中文描述: 4-BIT, FLASH, 4 MHz, MICROCONTROLLER, PDSO20
封裝: SSO-20
文件頁數(shù): 48/82頁
文件大小: 638K
代理商: T48C893-TK
T48C893
Rev. A4, 22-Jan-02
48 (82)
Timer 3
Mode 12: Timer / counter with external capture mode (T3I)
The counter is driven by an internal clock source and an edge at the external input T3I loads the counter value into the
capture register. The edge can be selected with the programmable edge detector of the timer input stage. This mode
can be used for signal and pulse measurements.
0 1 2 3 4 5 6 7 8 9 1011
Counter 3
T3CP
Register
13819
15
T3I
T3R
Capture value = X
Capture value = 17
Capture
value = 35
0
121314 16
20
171819
22
21 23
27
242526
29
28 30
34
313233
36
35 37
41
383940
Figure 55. External capture mode
Timer 3 Modulator for Carrier Frequency Burst Modulation
If the output stage operates as pulse-width modulator for the shift register the output can be stopped with stage 1 of
Timer 2. For this task, the timer mode 3 must be used and the prescaler must be supplied by the internal shift clock
of the shift register.
The modulator can be started with the start of the shift register (SIR=0) and stopped either by a shift register stop
(SIR=1) or compare match event of stage 1 of Timer 2. For this task, the Timer 2 must be used in mode 3 and the pre-
scaler stage must be supplied by the internal shift clock of the shift register.
13820
T3
Set
Res
T3O
T3TOP
OMSK
TOG3
SO
M2
SSI/
Control
M3
MUX
T3M
0
1
2
3
Timer 3 Mode
6
7
9
other
T3O
MUX 1
MUX 2
MUX 3
MUX 0
Figure 56. Modulator 3
Timer 3 Demodulator for Biphase, Manchester and Pulse-Width-Modulated Signals
The demodulator stage of Timer 3 can be used to decode Biphase, Manchester and pulse-width-coded signals
Demodulator 3
T3EX
Res
CM31
Counter 3
Reset
Counter 3
Control
SCI
SI
T3I
T3M
13821
Figure 57. Timer 3 demodulator 3
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