Rainbow Electronics T89C5121 - Manual (Page 3)

3
A/T8xC5121
4164G–SCR–07/06
Pin Description
Figure 2. 24-pin SSOP Pinout
Figure 3. QFN32 Pinout
P1.1/CC8
P1.4/CCLK
P1.0/CIO
RST
P1.5/CRST
1
P1.3/CC4
P1.2/CPRES
XTAL1
P3.3/INT1/OE
P3.2/INT0
P3.4/T0
P3.5/CIO1/T1
LI
C V
CC
CVSS V
CC
E V
CC
VSS
P3.0/RxD
P3.1/TxD
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
P3.6/CCLK1/LED0 XTAL2
P3.7/CRST1/LED1
D V
CC
N/C
QFN32
Vss
P1.1/CC8
P1.0/CIO
P1.2/CPRES
CVcc
P1.4/CCLK
P
3
.6/CCLK
1
/LE
D
0
N/C
XT
AL
1
P
3
.7/CRS
T
1
/LE
D
1
N/C
XT
AL
2
P3.5/CIO1/T1
P1.3/CC4
P1.5/CRST
Vc
c
CV
s
s
EV
c
c
N/C DV
c
c
P3.4/T0
P3.0/RxD
28 27 26
1
2
3
4
5
6
7
24
23
22
21
20
19
18
12 11 10 9 13 14 15
RST 8
16
17
Vss
P3.1/TxD
LI N/C
25 29 30 31 32
N/C
P3.2/INT0
P3.3/INT1/OE
N/
C