at89s8253-24psu ATMEL Corporation, at89s8253-24psu Datasheet - Page 3

• Manufacturer Part Number: at89s8253-24psu
• Description: At89s8253 8-bit Microcontroller With 12k Bytes Flash And 2k Bytes Eeprom
• Manufacturer: ATMEL Corporation

2.3
2.4
3. Pin Description
3.1
3.2
3.3
3.4
3286K–MICRO–12/06
44J – 44-lead PLCC
42PS6 – PDIP
VCC
GND
VDD
PWRVDD
Supply voltage (all packages except 42-PDIP).
Ground (all packages except 42-PDIP; for 42-PDIP GND connects only the logic core and the
embedded program/data memories).
Supply voltage for the 42-PDIP which connects only the logic core and the embedded pro-
gram/data memories.
Supply voltage for the 42-PDIP which connects only the I/O Pad Drivers.
The application board must connect both VDD and PWRVDD to the board supply voltage.
(MOSI) P1.5
(MISO) P1.6
(INT0) P3.2
(INT1) P3.3
(SCK) P1.7
(RXD) P3.0
(TXD) P3.1
(T0) P3.4
(T1) P3.5
(RXD) P3.0
(INT0) P3.2
(INT1) P3.3
(TXD) P3.1
(A10) P2.2
(A11) P2.3
(A12) P2.4
(A13) P2.5
(A14) P2.6
(A15) P2.7
(WR) P3.6
PWRGND
(RD) P3.7
(T0) P3.4
(T1) P3.5
(A8) P2.0
(A9) P2.1
RST
NC
XTAL2
XTAL1
GND
RST
7
8
9
10
11
12
13
14
15
16
17
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
P1.7 (SCK)
P1.6 (MISO)
P1.5 (MOSI)
P1.4 (SS)
P1.3
P1.2
P1.1 (T2EX)
P1.0 (T2)
VDD
PWRVDD
P0.0 (AD0)
P0.1 (AD1)
P0.2 (AD2)
P0.3 (AD3)
P0.4 (AD4)
P0.5 (AD5)
P0.6 (AD6)
P0.7 (AD7)
EA/VPP
ALE/PROG
PSEN
39
38
37
36
35
34
33
32
31
30
29
P0.4 (AD4)
P0.5 (AD5)
P0.6 (AD6)
P0.7 (AD7)
EA/VPP
NC
ALE/PROG
PSEN
P2.7 (A15)
P2.6 (A14)
P2.5 (A13)
AT89S8253
3