ATAM894 Datasheet, PDF (74/97 Pages) ATMEL Corporation – 8k-flash Microcontroller

Combination Mode 5: Bi-phase 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 Bi-phase 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 a stop signal for the modulator. This is an example for a 13-bit Bi-
phase telegram.
Figure 6-53. Bi-phase Modulation
SCLI
Buffer full
SIR
SO
SC
MSM
Timer 2
Mode 3
SCL
Counter 2/1
OMSK
T2O
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
Counter 2/1 = Compare Register 2/1 (= 5)
0
0000
0
000
123
4 ⁵⁰
1
2
74 ATAM894
4679D–4BMCU–05/05