T48C893 datasheet(61/82 Pages) ATMEL

61 / 82 page

T48C893

Rev. A4, 22-Jan-02

61 (82)

Serial Interface Status and Control Register (SISC)

Primary register address: ’A’hex

Bit 3

Bit 2

Bit 1

Bit 0

SISC

write

MCL

RACK

SIM

IFN

Reset value: 1111b

SISC

read

– – –

TACK

ACT

SRDY

Reset value: xxxxb

MCL

Multi-Chip Link activation

MCL = 1,

multi-chip link disabled. This bit has to be set to ’0’ during transactions to/from

the internal EEPROM

MCL = 0,

connnects SC and SD additional to the internal multi-chip link pads

RACK

Receive ACKnowledge status/control bit for I2C mode

RACK = 0,

transmit acknowledge in next receive telegram

RACK = 1,

transmit no acknowledge in last receive telegram

TACK

Transmit ACKnowledge status/control bit for I2C mode

TACK = 0,

acknowledge received in last transmit telegram

TACK = 1,

no acknowledge received in last transmit telegram

SIM

Serial Interrupt Mask

SIM = 1,

disable interrupts

SIM = 0,

enable serial interrupt. An interrupt is generated.

IFN

Interrupt FuNction

IFN = 1,

the serial interrupt is generated at the end of telegram

IFN = 0,

the serial interrupt is generated when the SRDY goes low (i.e., buffer becomes

empty/full in transmit/receive mode)

SRDY

Serial interface buffer ReaDY status flag

SRDY = 1,

in receive mode:

receive buffer empty

in transmit mode:

transmit buffer full

SRDY = 0,

in receive mode:

receive buffer full

in transmit mode:

transmit buffer empty

ACT

Transmission ACTive status flag

ACT = 1,

transmission is active, i.e., serial data transfer. Stop or start conditions are currently in

progress.

ACT = 0,

transmission is inactive

Serial Transmit Buffer (STB) – Byte Write

Primary register address: ’9’hex

STB

First write cycle

Bit 3

Bit 2

Bit 1

Bit 0

Reset value: xxxxb

Second write cycle

Bit 7

Bit 6

Bit 5

Bit 4

Reset value: xxxxb

The STB is the transmit buffer of the SSI. The SSI transfers the transmit buffer into the shift register and starts shifting

with the most significant bit.

T48C893 Datasheet(PDF) 61 Page - ATMEL Corporation

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