AT90SCR100 datasheet(193/433 Pages) ATMEL

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TPR0327AY–SMS–30Jan09

AT90SCR100

The CC4 pin can be used as a pseudo bi-directional I/O when this bit is set.

VCARDOK=1 (SCISR.4 bit) condition must be true to change the state of CC4 pin

• Bit 3 – CARDIO: Card I/O

If UART bit is cleared in SCICR register, this bit enables the use of the Card IO pin (CIO pin) as

a standard bi-directional port :

• To read from CIO port pin : set CARDIO bit then read CARDIO bit to have the CIO port value

• To write in CIO port pin : set CARDIO bit to write a 1 in CIO port pin , clear CARDIO bit to

write a 0 in CIO port pin.

VCARDOK=1 (SCISR.4 bit) condition must be true to change the state of CIO pin

• Bit 2 – CARDCLK: Card CLK

When the CLK bit is cleared in SCCON Register, the value of this bit is driven to the Card CLK

pin.

VCARDOK=1 (SCISR.4 bit) condition must be true to change the state of Card CLK pin.

• Bit 1 – CARDRST: Card RST

Clear this bit to drive a low level on the Card RST pin.

Set this bit to set a high level on the Card RST pin.

VCARDOK=1 (SCISR.4 bit) condition must be true to change the state of Card RST pin.

• Bit 0 – CARDVCC: Card Vcc Control

Clear this bit to deactivate the Card interface and set its power-off. The other bits of SCCON reg-

ister have no effect while this bit is cleared.

Set this bit to power-on the Card interface. The activation sequence should be handled by

software.

15.7.3

SCISR - Smart Card UART Interface Status Register

• Bit 7 – SCTBE: 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.

• Bit 6 – CARDIN: Card Presence Status

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

software).

Bit

$0000FD

SCTBE

CARDIN

VCARDOK

SCWTO

SCTC

SCRC

SCPE

SCISR

Read/write

R/W

Initial value

0x80

This bit can only be used if the Guardtime parameter is lesser or equal to 11etu.

The meaning of this bit if guardtime is higher than 11etu is not reliable; In this

case, using SCTC is mandatory.

Caution

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