Rainbow Electronics AT89C5122 User Manual
Page 87
87
AT8xC5122/23
4202E–SCR–06/06
Reset Value = 0000 0000b
Reset Value = 0010 0101b
Reset Value = 1000 0000b
Table 56. Smart Card Character/Block Waiting Time Register 2
SCWT2 (S:B6h, SCRS=0)
7
6
5
4
3
2
1
0
WT23
WT22
WT21
WT20
WT19
WT18
WT17
WT16
Bit Number
Bit Mnemonic
Description
7 - 0
WT[23:16]
Waiting Time Byte2
Used together with WT[31:24] and WT[15:0] in registers SCWT3,SCWT1, SCWT0 (see Table 58).
Table 57. Smart Card Character/Block Waiting Time Register 1
SCWT1 (S:B5h, SCRS=0)
7
6
5
4
3
2
1
0
WT15
WT14
WT13
WT12
WT11
WT10
WT9
WT8
Bit Number
Bit Mnemonic
Description
7 - 0
WT[15:8]
Waiting Time Byte 1
Used together with WT[31:16] and WT[7:0] in registers SCWT3,SCWT2, SCWT0 (see Table 55).
Table 58. Smart Card Character/Block Waiting Time Register 0
SCWT0 (S:B4h, SCRS=0)
7
6
5
4
3
2
1
0
WT7
WT6
WT5
WT4
WT3
WT2
WT1
WT0
Bit Number
Bit Mnemonic
Description
7 - 0
WT[7:0]
Waiting Time Byte 0
WT[31:0] is the reload value of the Waiting Time Counter (WTC).
The WTC is a general-purpose timer. It is using the ETU clock and is controlled by the WTEN bit (see Table 44 on
page 79 and Section “Waiting Time (WT) Counter”, page 69).
When UART bit of Registers is set, the WTC is automatically reloaded at each start bit of the UART. It is used to
check the maximum time between to consecutive start bits.