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參數(shù)資料
| 型號(hào)： | M44C890 |
| 廠商： | ATMEL CORP |
| 元件分類： | 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 |
| 文件頁數(shù)： | 49/63頁 |
| 文件大小： | 503K |
| 代理商： | M44C890 |
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M44C890
M44C090
Rev.A4, 14-Dec-01
49 (63)
Combination mode 4: Manchester modulation 2
SSI mode 1:
8-bit shift register internal data output (SO) to the Timer 2 modulator stage
Timer 2 mode 3:
Timer 2 output mode 5:
8-bit compare counter and 4-bit prescaler
The modulator 2 of Timer 2 modulates the SSI data output to Manchester code
The 4-bit stage can be used as prescaler for the SSI to generate the stop signal for modulator 2. The SSI has a special
mode to supply the prescaler with the shift-clock. The control output signal (OMSK) of the SSI is used as stop signal
for the modulator. This is an example for a 12-bit Manchester telegram:
0
0
0
0
0
0
0
0
1
2
3
4
0
1
2
0
Counter 2/1 = Compare Register 2/1 (= 4)
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
SCLI
Buffer full
SIR
SO
SC
MSM
Timer 2
Mode 3
SCL
Counter 2/1
OMSK
T2O
13837
3
Figure 57. Manchester modulation 2
Combination mode 5: Biphase modulation 2
SSI mode 1:
8-bit shift register internal data output (SO) to the Timer 2 modulator stage
Timer 2 mode 3:
Timer 2 output mode 4:
8-bit compare counter and 4-bit prescaler
The modulator 2 of Timer 2 modulates the SSI data output to Biphase code
The 4-bit stage can be used as prescaler for the SSI to generate the stop signal for modulator 2. The SSI has a special
mode to supply the prescaler via the shift-clock. The control output signal (OMSK) of the SSI is used as stop signal
for the modulator. This is an example for a 13-bit Biphase telegram:
0
0
0
0
0
0
0
0
1
2
3
4
5
0
Counter 2/1 = Compare Register 2/1 (= 5)
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
SCLI
Buffer full
SIR
SO
SC
MSM
Timer 2
Mode 3
SCL
Counter 2/1
OMSK
T2O
13838
0
1
2
Figure 58. Biphase modulation
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