ACS ACR38K Smart Keyboard - Manual (Page 16)

ACR38x (CCID) – Reference Manual [email protected]
Version 6.04 www.acs.com.hk
Page 16 of 58
Offset Field Size Value Description
11 bmTCCKST0 1
B0 – 0b, B7-2 – 000000b
B1 – Convention used (b1=0 for direct,
b1=1 for inverse) Note: The CCID
ignores this bit.
12 bGuardTimeT0 1
Extra Guardtime between two
characters. Add 0 to 254 etu to the
normal guardtime of 12 etu. FFh is the
same as 00h.
13 bWaitingIntegerT0 1 WI for T=0 used to define WWT
14 bClockStop 1
ICC Clock Stop Support
00h = Stopping the Clock is not allowed
01h = Stop with Clock signal Low
02h = Stop with Clock signal High
03h = Stop with Clock either High or
Low
Protocol Data Structure for Protocol T=1 (dwLength=00000007h)
Offset Field Size Value Description
10 bmFindexDindex 1
B7-4 – FI – Index into the table 7 in
ISO/IEC 7816-3:1997 selecting a clock
rate conversion factor
B3-0 – DI - Index into the table 8 in
ISO/IEC 7816-3:1997 selecting a baud
rate conversion factor
11 BmTCCKST1 1
B7-2 – 000100b
B0 – Checksum type (b0=0 for LRC,
b0=1 for CRC)
B1 – Convention used (b1=0 for direct,
b1=1 for inverse) Note: The CCID
ignores this bit.
12 BGuardTimeT1 1
Extra Guardtime (0 to 254 etu between
two characters). If value is FFh, then
guardtime is reduced by 1 etu.
13 BwaitingIntegerT1 1
B7-4 = BWI values 0-9 valid
B3-0 = CWI values 0-Fh valid