Owner's manual

A/T8xC5121

4164G–SCR–07/06

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

76543210

- - - CREPSEL ALTKPS1 ALTKPS0 SCCLK1 SCRS

Bit

Number

Bit

Mnemonic Description

7-Reserved

6-Reserved

5-Reserved

4 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

1 SCCLK1

Alternate card clock selection

Set to select the prescaled clock (CCLK1)

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

0 SCRS

Smart card register selection

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

76543210

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