89C5121-SK1 Atmel, 89C5121-SK1 Datasheet - Page 44

• 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

44
A/T8xC5121
Table 22. SCRBUF Register
SCRBUF (S:AA read-only, SCRS = 1)
Smart Card Receive Buffer Register
Reset Value = 0000 0000b
Table 23. SCETU1 Register
SCETU1 (S:ADh, SCRS = 1)
Smart Card ETU Register 1
Reset Value = 0XXX X001b
Number
Number
COMP
Bit
Bit
6-3
2-0
7
7
–
–
7
Mnemonic Description
Mnemonic Description
ETU[10:8]
COMP
Bit
Bit
6
6
–
–
–
–
Provides the byte received from the I/O pin when SCRI is set.
Bit ordering on the I/O pin depends on the Convention (see SCICR Register).
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.
Reserved
The value read from these bits is indeterminate. Do not change these bits .
ETU MSB
Used together with the ETU LSB (see SCETU0 Register).
5
5
–
–
4
4
–
–
3
3
–
–
ETU10
2
2
–
ETU9
1
1
–
4164G–SCR–07/06
ETU8
0
0
–