Pin Description
Figure 2.
24-pin SSOP Pinout
CVSS
LI
C
V
CC
P1.5/CRST
P1.4/CCLK
P1.3/CC4
P1.2/CPRES
P1.1/CC8
P1.0/CIO
RST
XTAL2
1
2
3
4
5
6
7
8
9
10
11
12
SSOP24
24
23
22
21
20
19
18
17
16
15
14
13
V
CC
E
V
CC
D
V
CC
VSS
P3.0/RxD
P3.1/TxD
P3.3/INT1/OE
P3.4/T0
P3.2/INT0
P3.5/CIO1/T1
P3.6/CCLK1/LED0
P3.7/CRST1/LED1
XTAL1
Figure 3.
32-pin QFN Pinout
CVss
Vcc
EVcc
DVcc
N/C
LI
N/C
32 31 30 29 28 27 26 25
CVcc
P1.5/CRST
P1.4/CCLK
P1.3/CC4
P1.2/CPRES
P1.1/CC8
P1.0/CIO
RST
1
2
3
4
5
6
7
8
N/C
N/C
QFN32
24
23
22
21
20
19
18
17
Vss
Vss
P3.0/RxD
P3.1/TxD
P3.3/INT1/OE
P3.4/T0
P3.2/INT0
P3.5/CIO1/T1
9 10 11 12 13 14 15 16
P3.7/CRST1/LED1
P3.6/CCLK1/LED0
N/C
N/C
XTAL2
XTAL1
N/C
Table 1.
Port Signal Description
Internal
Port
P1.0
Signal
Name
CIO
Power
Supply
CV
CC
ESD
4 kV
Type
I/O
Description
Smart Card Interface Function
Card I/O – Pull-up medium is lower than 20KΩ
Smart Card Interface Function
Card contact 8 – Pull-up medium must be less than 20KΩ
Smart Card Interface Function
Card presence
P1.1
CC8
CV
CC
4 kV
I/O
P1.2
CPRES
V
CC
4 kV
I
4
AT83C21GC
4247DS–SCR–03/07
ATMEL [ ATMEL CORPORATION ]
