ATA6020N_05 Datasheet, PDF (55/69 Pages) ATMEL Corporation – Low-current Microcontroller for Watchdog Function

ATA6020N
Combination Mode 5: Bi-phase Modulation 2
SSI mode 1:
8-bit shift register internal data output (SO) to 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. Figure 5-37 is an example for a
13-bit Bi-phase telegram.
Figure 5-37. Bi-phase Modulation
SCLI
Buffer full
SIR
SO
SC
MSM
Timer 2
Mode 3
SCL
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
0
0
0
0
0
Counter 2/1 = Compare Register 2/1 (= 5)
0000 1234
50
1
2
55
4708D–4BMCU–09/05