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AT90SCR100 Datasheet(PDF) 198 Page - ATMEL Corporation |
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AT90SCR100 Datasheet(HTML) 198 Page - ATMEL Corporation |
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198 / 433 page  198 TPR0327AY–SMS–30Jan09 AT90SCR100 15.7.8 SCETU - Smart Card ETU Register • Bit 15 – COMP: Compensation Clear this bit when no time compensation is needed (i.e. when the ETU to Card CLK period ratio is close to an integer with an error less than 1/4 of Card CLK period). Set this bit otherwise and reduce the ETU period by 1 Card CLK cycle for even bits. • Bit 14..11 – Reserved Bits These bits are reserved for future use. • Bit 10..0 – ETU: ETU Value The Elementary Time Unit is (ETU[10:0] - 0.5*COMP)/f, where f is the Card CLK frequency. According to ISO 7816, ETU[10:0] can be set between 11 and 2048. The default reset value of ETU[10:0] is 372 (F=372, D=1). 15.7.9 SCGT - Smart Card Guard Time Register • Bit 15..9 – Reserved Bits These bits are reserved for future use. Bit 15 141312 11 10 9 8 $0000F8 COMP ---- ETU [10..8] SCETUH $0000F7 ETU [7..0] SCETUL Bit 7 6543 2 1 0 Read/write R/W R R R R R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W Initial value 0 0 0 0 0 0 0 1 0x01 0 1110 1 0 0 0x74 The ETU counter is reloaded at each register’s write operation. Do not change this register during character reception or transmission or while Guard Time or Waiting Time Counters are running. Note Caution ! Bit 15 141312 11 10 9 8 $0000F6 ----- - - GT8 SCGTH $0000F5 GT [7..0] SCGTL Bit 7 6543 2 1 0 Read/write RRRR R R R R/W R/W R/W R/W R/W R/W R/W R/W R/W Initial value 0 0 0 0 0 0 0 0 0x00 0 0001 1 0 0 0x0C |
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