Rainbow-electronics ATAR862-8 User Manual download pdf (Page 81)

ATAR862-8

4589B–4BMCU–02/03

Combination Mode Timer 3 and SSI

Figure 81. Combination Timer 3 and SSI

Combination Mode 6:

FSK Modulation

SSI mode 1: 8-bit shift register internal data output (SO) to the Timer 3

Timer 3 mode 8: FSK modulation with shift register data (SO)

The two compare registers are used to generate two varied time intervals. The SSI data

output selects which compare register is used for the output frequency generation. A "0"

level at the SSI data output enables the compare register 1 and a "1" level enables the

compare register 2. The compare and compare mode registers must be programmed to

generate the two frequencies via the output toggle flip-lop. The SSI can be supplied with

the toggle signal of Timer 2 or any other clock source. The Timer 3 counter is driven by

an internal or external clock source.

8-bit counter 3

RES

Compare 3/1

T3CO1

T3CP

T3CO2

Timer 3 - control

T3O

CL3

T3I

T3EX

SYSCL

T1OUT

POUT

I/O-bus

Compare 3/2

T3CM1 T3CM2

T3C T3ST

Modulator 3

Demodu-

lator 3

Control

TOG3

INT5

RES

CM31

T3I

T3EX

T3MT3CS

CP3

8-bit shift register

MSB LSB

Shift_CL

SIC1 SIC2

SISC

SCLI

Control

STB SRB

Output

INT3

I/O-bus

SSI-control

TOG2

POUT

T1OUT

SYSCL

MCL_SC

MCL_SD

Transmit buffer Receive buffer

1 2 ... 76 77 78 79 80 81 82 83 84 85 86 ... 105 106

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Rainbow-electronics ATAR862-8 User Manual Page 81

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