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ATAM894 Datasheet(PDF) 73 Page - ATMEL Corporation

Part # ATAM894
Description  Read Protection for the EEPROM Program Memory
PDF  97 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATAM894 Datasheet(HTML) 73 Page - ATMEL Corporation

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73
4679D–4BMCU–05/05
ATAM894
Figure 6-51.
Manchester Modulation 1
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:
8-bit compare counter and 4-bit prescaler
Timer 2 output mode 5:
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:
Figure 6-52.
Manchester Modulation 2
TOG2
SC
SO
T2O
00
0
00
1
1
0
1
0
1
11
1
1
8-bit SR data
Bit 7
Bit 0
0
Bit 7
Bit 0
Data: 00110101
0
000
0
0
00
1
2
3
40
12
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
3



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