AT80C32X2 查看數據表（PDF） - Atmel Corporation
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AT80C32X2 Datasheet PDF : 55 Pages
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Mnemonic
Pin Number
VQFP
DIL LCC 1.4
VSS
20 22
16
Vss1
1
39
VCC
P0.0-P0.7
40 44
38
39- 43-
32 36
37-30
P1.0-P1.7
1-8 2-9
40-44
1-3
P2.0-P2.7
12
40
23
41
21- 24-
28 31
18-25
P3.0-P3.7
10- 11,
17 13-
19
5,
7-13
10 11
5
11 13
7
12 14
8
Type Name and Function
I Ground: 0V reference
I Optional Ground: Contact the Sales Office for ground
connection.
I
Power Supply: This is the power supply voltage for normal,
idle and power-down operation
I/O
Port 0: Port 0 is an open-drain, bidirectional I/O port. Port 0
pins that have 1s written to them float and can be used as
high impedance inputs.Port 0 pins must be polarized to Vcc
or Vss in order to prevent any parasitic current consumption.
Port 0 is also the multiplexed low-order address and data bus
during access to external program and data memory. In this
application, it uses strong internal pull-up when emitting 1s.
Port 0 also inputs the code bytes during EPROM
programming. External pull-ups are required during program
verification during which P0 outputs the code bytes.
I/O Port 1: Port 1 is an 8-bit bidirectional I/O port with internal
pull-ups. Port 1 pins that have 1s written to them are pulled
high by the internal pull-ups and can be used as inputs. As
inputs, Port 1 pins that are externally pulled low will source
current because of the internal pull-ups. Port 1 also receives
the low-order address byte during memory programming and
verification.
Alternate functions for Port 1 include:
I/O T2 (P1.0): Timer/Counter 2 external count input/Clockout
I
T2EX (P1.1): Timer/Counter 2 Reload/Capture/Direction
Control
I/O
Port 2: Port 2 is an 8-bit bidirectional I/O port with internal
pull-ups. Port 2 pins that have 1s written to them are pulled
high by the internal pull-ups and can be used as inputs. As
inputs, Port 2 pins that are externally pulled low will source
current because of the internal pull-ups. Port 2 emits the high-
order address byte during fetches from external program
memory and during accesses to external data memory that
use 16-bit addresses (MOVX atDPTR).In this application, it
uses strong internal pull-ups emitting 1s. During accesses to
external data memory that use 8-bit addresses (MOVX atRi),
port 2 emits the contents of the P2 SFR. Some Port 2 pins
receive the high order address bits during EPROM
programming and verification: P2.0 to P2.4
I/O
Port 3: Port 3 is an 8-bit bidirectional I/O port with internal
pull-ups. Port 3 pins that have 1s written to them are pulled
high by the internal pull-ups and can be used as inputs. As
inputs, Port 3 pins that are externally pulled low will source
current because of the internal pull-ups. Port 3 also serves
the special features of the 80C51 family, as listed below.
I RXD (P3.0): Serial input port
O TXD (P3.1): Serial output port
I INT0 (P3.2): External interrupt 0
6 TS8xCx2X2
4184I–8051–02/08
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