Rainbow Electronics T89C5121 User Manual
Page 46
46
A/T8xC5121
4164G–SCR–07/06
Table 27. SCWT2 Register
SCWT2 (S:B6h, SCRS = 0)
Smart Card Character/Block Wait Time Register 2
Reset Value = 0000 0000b
Table 28. SCWT1 Register
SCWT1 (S:B5h, SCRS = 0) Smart Card Character/Block Wait Time Register 1
Reset Value = 0010 0101b
Table 29. SCWT0 Register
SCWT0 (S:B4h, SCRS = 0)
Smart Card Character/Block Wait Time Register 0
Reset Value = 1000 0000b
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]
Wait Time Byte 2
Used together with WT[15:0] (see SCWT0 Register).
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]
Wait Time Byte 1
Used together with WT[23:16] and WT[7:0] (see SCWT0 Register).
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]
Wait Time Byte 0
WT[23:0] is the reload value of the Wait Time counter WTC.
The WTC is a general-purpose Timer 0. It is using the ETU clock and is
controlled by the WTEN bit (see Section “Waiting Time Counter (WT)”).
When UART bit of SCICR Register 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.