T83C5121 datasheet(41/110 Pages) ATMEL

41 / 110 page

T8xC5121

4164E–SCR–02/04

Table 20. SCSR Register

SCSR (S:ABh) Smart Card Selection Register

Reset Value = XXX0 1000b

Table 21. SCTBUF Register

SCTBUF (S:AA, write-only, SCRS = 0) Smart Card Transmit Buffer Register

Reset Value = 0000 0000b

CREPSEL

ALTKPS1

ALTKPS0

SCCLK1

SCRS

Bit

Number

Bit

Mnemonic

Description

Reserved

CREPSEL

Character repetition selection

Clear this bit to select 5 times repetition before parity error indication

Set this bit to select 4 times repetition before parity error indication

3-2

ALTKPS1

ALTKPS0

Alternate Card Clock prescaler factor

00ALTKPS = 0: prescaler factor equals 1

01ALTKPS = 1: prescaler factor equals 2

10ALTKPS = 2: prescaler factor equals 4 (reset value)

11ALTKPS = 3:

prescaler factor equals 8

SCCLK1

Alternate card clock selection

Set to select the prescaled clock (CCLK1)

Clear to select the standard port configuration (P3.6)

SCRS

Smart card register selection

The SCRS bit selects which set of the SCIB registers is accessed.

Bit Number

Bit Mnemonic Description

––

Can store a new byte to be transmitted on the I/O pin when SCTBE is set.

Bit ordering on the I/O pin depends on the Convention (see SCICR

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