參數(shù)資料
型號(hào): M44C890
廠商: ATMEL CORP
元件分類(lèi): 微控制器/微處理器
英文描述: Low-Current Microcontroller for Wireless Communication
中文描述: 4-BIT, MROM, 4 MHz, MICROCONTROLLER, PDSO20
封裝: SSO-20
文件頁(yè)數(shù): 31/63頁(yè)
文件大?。?/td> 503K
代理商: M44C890
M44C890
M44C090
Rev.A4, 14-Dec-01
31 (63)
Timer 2 Output Modes
The signal at the timer output is generated via
modulator 2. In the toggle mode, the compare match
event toggles the output T2O. For high resolution duty-
cycle modulation 8 bits or 12 bits can be used to toggle the
output. In the duty-cycle burst
modulator modes the DCG
output is connected to T2O and switched on and off either
by the toggle flipflop output or the serial data line of the
SSI. Modulator 2 also has 2 modes to output the content
of the serial interface as Biphase or Manchester code.
The modulator output stage can be configured by the
output control bits in the T2M2 register. The modulator
is started with the start of the shift register (SIR = 0) and
stopped either by carrying out a shift register stop
(SIR = 1) or compare match event of stage 1 (CM1) of
Timer 2. For this task, Timer 2 mode 3 must be used and
the prescaler has to be supplied with the internal shift
clock (SCL).
13395
Toggle
RES/SET
Biphase/
Manchester
modulator
T2TOP
T2OS2, 1, 0
T2M2
T2O
M2
M2
S1
S2
S3
RE
FE
OMSK
SSI
CONTROL
TOG2
SO
DCGO
Figure 33. Timer 2 modulator output stage
Timer 2 Output Signals
Timer 2 output mode 1:
Toggle mode A:
a Timer 2 compare match toggles the output flip-flop (M2)
> T2O
4
0
0
0
1
2
3
4
0
1
2
3
4
0
1
2
3
0
1
Input
Counter 2
T2R
Counter 2
CMx
INT4
T2O
13781
Figure 34. Interrupt timer / square wave generator
the output toggles with each edge compare match event
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