T48C893 datasheet(62/82 Pages) ATMEL

62 / 82 page

T48C893

Rev. A4, 22-Jan-02

62 (82)

Serial Receive Buffer (SRB) – Byte Read

Primary register address: ’9’hex

SRB

First read cycle

Bit 7

Bit 6

Bit 5

Bit 4

Reset value: xxxxb

Second read cycle

Bit 3

Bit 2

Bit 1

Bit 0

Reset value: xxxxb

The SRB is the receive buffer of the SSI. The shift register clocks serial data in (most significant bit first) and loads

content into the receive buffer when complete telegram has been received.

4.3.5

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 demodulation. The modulator and demodu-

lator units work together with the timers and shift the data bits into or out of the shift register.

Combination Mode 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

Control

T2C

CL2/1

T2I

SYSCL

T1OUT

TOG3

SCL

I/O–bus

13836

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

CM1

I/O–bus

POUT

SCL

DCGO

TOG2

Figure 68. Combination Timer 2 and SSI

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