atam894 ATMEL Corporation, atam894 Datasheet - Page 73

• Manufacturer Part Number: atam894
• Description: Atam894 8k-flash Microcontroller
• Manufacturer: ATMEL Corporation

4679D–4BMCU–05/05
Figure 6-51. Manchester Modulation 1
Combination Mode 4: Manchester Modulation 2
SSI mode 1:
Timer 2 mode 3:
Timer 2 output mode 5:
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
Counter 2/1
Buffer full
Timer 2
Mode 3
OMSK
TOG2
SCLI
MSM
SCL
T2O
T2O
SIR
SO
SC
SO
SC
0
Data: 00110101
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
Bit 7
Bit 7
0
0
0
0
0
0
8-bit shift register internal data output (SO) to the Timer 2
modulator stage
8-bit compare counter and 4-bit prescaler
The modulator 2 of Timer 2 modulates the SSI data output
to Manchester code
0
0
Counter 2/1 = Compare Register 2/1 (= 4)
1
0
1
0
1
0
1
8-bit SR data
0
0
0
1
1
2
1
3
0
4
0
0
1
1
Bit 0
Bit 0
1
ATAM894
2
3
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