AT90SCR100 datasheet(197/433 Pages) ATMEL

197 / 433 page

197

TPR0327AY–SMS–30Jan09

AT90SCR100

This bit is reserved for future use.

• Bit 6 – BGTEN: Block Guard Time Enable

Set this bit to select the minimum interval between the leading edge of the start bits of the last

character received from the ICC and the first character sent by the Terminal. The transfer of

GT[8-0] value to the BGT counter is done on the rising edge of the BGTEN.

Clear this bit to suppress the minimum time between reception and transmission.

• Bit 5 – Reserved Bit

This bit is reserved for future use.

• Bit 4 – CREPSEL: Character Repetition Selection

Clear this bit to select 5 times transmission (1 original + 4 repetitions) before parity error indica-

tion (conform to EMV).

Set this bit to select 4 times transmission (1 original + 3 repetitions) before parity error indication.

• Bit 3 – CPRESRES: Card Presence Pull-up Resistor

Clear this bit to connect the internal 100K Pull-up on CPRES pin.

Set this bit to disconnect the internal pull-up from this pin.

• Bit 2..0 – Reserved Bits

These bits are reserved for future use. Writing these reserved bits can have side effects. Take

care of not writing them.

15.7.7

SCIBUF - Smart Card Transmit/Receive Buffer

• Bit 7..0 – SCIBUFD7..0: Smart Card Transmit/Receive Buffer

A new byte can be written in the buffer to be transmitted on the I/O pin when SCTBE bit is set.

The bits are sorted and copied on the I/O pin according to the active convention.

A new byte received from I/O pin is ready to be read when SCRI bit is set. The bits are sorted

according to the active convention.

Bit

$0000F9

SCIBUFD [7..0]

SCIBUF

Read/write

R/W

Initial value

0x00

AT90SCR100 Datasheet(PDF) 197 Page - ATMEL Corporation