Rainbow Electronics ATAR862-8 - Manual (Page 77)

77
ATAR862-8
4589B–4BMCU–02/03
Combination Modes
The UTCM consists of two timers (Timer 2 and Timer 3) and a serial interface. There is
a multitude of modes in which the timers and serial interface can work together.
The 8-bit wide serial interface operates as shift register for modulation and demodula-
tion. The modulator and demodulator units work together with the timers and shift the
data bits into or out of the shift register.
Combination Mode
Timer 2 and SSI
Figure 75. Combination Timer 2 and SSI
4-bit counter 2/1
RES OVF1
Compare 2/1
T2CO1
POUT
CL2/2
DCG
T2M1 P4CR
8-bit counter 2/2
RES OVF2
Compare 2/2
T2CO2 T2CM
Timer 2 - control
TOG2
INT4
Biphase-,
Manchester-
modulator
Output
MOUT
T2O
Timer 2
modulator
output-stage
T2M2
SO Control
T2C
CL2/1
T2I
SYSCL
T1OUT
TOG3
SCL
I/O-bus
8-bit shift register
MSB LSB
Shift_CL
SO
SIC1 SIC2 SISC
SCLI
Control
STB SRB
SI
Output
INT3
I/O-bus
SSI-control
TOG2
POUT
T1OUT
SYSCL MCL_SC
MCL_SD
Transmit
buffer
Receive
buffer
CM1
I/O-bus
POUT
SO
SCL
SC
SD
DCGO
TOG2