Rainbow-electronics ATAR862-8 User Manual download pdf (Page 75)

ATAR862-8

4589B–4BMCU–02/03

• In Transmit mode (SDD = 1) shifting starts only if the transmit buffer has been

loaded (SRDY = 1).

• Setting SIR-bit loads the contents of the shift register into the receive buffer

(synchronous 8-bit mode only).

• In MCL modes, writing a 0 to SIR generates a start condition and writing a 1

generates a stop condition.

Serial Interface Control

Auxiliary register address: "A"hex

Note: SDD controls port directional control and defines the reset function for the SRDY-flag

Bit 3Bit 2Bit 1Bit 0

MSM SM1 SM0 SDD Reset value: 1111b

MSM M

odular Stop Mode

MSM = 1, modulator stop mode disabled (output masking off)

MSM = 0, modulator stop mode enabled (output masking on) - used in

modulation modes for generating bit streams which are not sub–multiples of 8

bits.

SM1 Serial Mode control bit 1

SM0 S

erial Mode control bit 0

Mode SM1 SM0 SSI Mode

1 1 1 8-bit NRZ-Data changes with the rising edge of SC

2 1 0 8-bit NRZ-Data changes with the falling edge of SC

3 0 1 9-bit two-wire MCL mode

4 0 0 8-bit two-wire MCL mode (no acknowledge)

SDD Serial Data Direction

SDD = 1, transmit mode – SD line used as output (transmit data). SRDY is set

by a transmit buffer write access.

SDD = 0, receive mode – SD line used as input (receive data). SRDY is set

by a receive buffer read access

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Rainbow-electronics ATAR862-8 User Manual Page 75