AT89C5122D-RDRUM datasheet(79/208 Pages) ATMEL

79 / 208 page

AT83R5122, AT8xC5122/23

4202F–SCR–07/2008

Reset Value = 1000 0000b

Table 46.

Smart Card UART Interface Status Register -

SCISR (S:ADh, SCRS=0)

SCTBE

CARDIN

ICARDOVF

VCARDOK

SCWTO

SCTC

SCRC

SCPE

Bit Number

Bit Mnemonic

Description

7SCTBE

UART Transmit Buffer Empty Status

This bit is set by hardware when the Transmit Buffer is copied to the transmit shift register of the Smart Card

UART.

It is cleared by hardware when SCIBUF register is written.

CARDIN

Card Presence Status

This bit is set by hardware if there is a card presence (debouncing filter has to be done by software).

This bit is cleared by hardware if there is no card presence.

ICARDOVF

Card Current Overflow Status

This bit is set when the current on card is above the limit specified by bit OVFADJ in DCCKPS register (Table 61

on page 92)

It is cleared by hardware.

VCARDOK

Card Voltage Correct Status

This bit is set when the output voltage is within the voltage range specified by VCARD[1:0] in SCICR register.

It is cleared otherwise.

3SCWTO

Waiting Time Counter Timeout Status

This bit is set by hardware when the Waiting Time Counter has expired.

It is cleared by the reload of the counter or by the reset of the SCIB.

2SCTC

UART Transmitted Character Status

This bit is set by hardware when the Smart Card UART has transmitted a character. If character repetition mode is

selected, this bit will be set only after a successful transmission. If the last allowed repetition in not successful, this

bit will not be set.

It is cleared by software when this register is read.

SCRC

UART Received Character Status

This bit is set by hardware when the Smart Card UART has received a character

It is cleared by hardware when SCIBUF register is read. If character repetition mode is selected, this bit will be set

only after a successful reception. If the last allowed repetition is still unsuccessful, this bit will be set to let the user

read the erroneous value if necessary.

0SCPE

Character Reception Parity Error Status

This bit is set when a parity error is detected on the received character.

It is cleared by software when this register is read. If character repetition mode is selected, this bit will be set only

if the ICC report an error on the last allowed repetition of a TERMINAL transmission, or if a reception parity error

is found on the last allowed ICC character repetition.

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