89C5121-SK1 Atmel, 89C5121-SK1 Datasheet - Page 45

• Manufacturer Part Number: 89C5121-SK1
• Description: KIT SMART CARD FOR AT89C5121
• Manufacturer: Atmel
• Type: Smart Cardr

Specifications of 89C5121-SK1

• Contents: Board
• For Use With/related Products: AT89C5121
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: T89C5121-SK1; T89C5121-SK1

4164G–SCR–07/06
Table 24. SCETU0 Register
SCETU0 (S:ACh, SCRS = 1)
Smart Card ETU Register 0
Reset Value = 0111 0100b
Table 25. SCGT1 Register
SCGT1 (S:B5h, SCRS = 1)
Smart Card Transmit Guard Time Register 1
Reset Value = XXXX XXX0b
Table 26. SCGT0 Register
SCGT0 (S:B4h, SCRS = 1)
Smart Card Transmit Guard Time Register 0
Reset Value = 0000 1100b
Number
Number
Number
ETU7
GT7
Bit
Bit
Bit
7-0
7-1
7-0
7
7
7
–
0
Mnemonic Description
Mnemonic Description
Mnemonic Description
ETU[7:0]
GT[7:0]
ETU6
GT6
GT8
Bit
Bit
Bit
6
6
6
–
–
ETU LSB
The Elementary Time Unit is (ETU[10:0] - 0.5*COMP)/f, where f is the Card CLK
frequency.
According to ISO7816, ETU[10:0] can be set between 11 and 2047.
The default reset value of ETU[10:0] is 372 (F = 372, D = 1).
Reserved
The value read from these bits is indeterminate. Do not change these bits .
Transmit Guard Time MSB
Used together with the Transmit Guard Time LSB (see SCGT0 Register).
Transmit Guard Time LSB
The minimum time between two consecutive start bits in transmit mode is
GT[8:0] * ETU.
According to ISO 7816, GT can be set between 11 and 266 (11 to 254+12 ETU).
ETU5
GT5
5
5
5
–
ETU4
GT4
4
4
4
–
ETU3
GT3
3
3
3
–
ETU2
GT2
2
2
2
–
A/T8xC5121
ETU1
GT1
1
1
1
–
ETU0
GT8
GT0
0
0
0
45