AT80C51RD2-RLRUM 查看數據表（PDF） - Atmel Corporation
零件编号
产品描述 (功能)
比赛名单
AT80C51RD2-RLRUM Datasheet PDF : 83 Pages
| |||
Table 2. Pin Description
Mnemonic
VSS
VCC
P0.0 - P0.7
P1.0 - P1.7
XTAL1
XTAL2
Pin Number
DIL
PLCC44 VQFP44 1.4
20
22
16
40
44
38
39 - 32 43 - 36
37 - 30
1-8
2-9
40 - 44
1-3
1
2
40
2
3
41
3
4
42
4
5
43
5
6
44
6
7
1
7
8
2
8
9
3
19
21
15
18
20
14
Type
I
I
I/O
I/O
I/O
I/O
I/O
I
I/O
I
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I
O
Name and Function
Ground: 0V reference
Power Supply: This is the power supply voltage for normal, idle and power-down
operation
Port 0: Port 0 is an open-drain, bi-directional I/O port. Port 0 pins that have 1s
written to them float and can be used as high impedance inputs. Port 0 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.
Port 1: Port 1 is an 8-bit bi-directional 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 T89C51RB2/RC2 Port 1 include:
P1.0: Input/Output
T2 (P1.0): Timer/Counter 2 external count input/Clockout
P1.1: Input/Output
T2EX: Timer/Counter 2 Reload/Capture/Direction Control
P1.2: Input/Output
ECI: External Clock for the PCA
P1.3: Input/Output
CEX0: Capture/Compare External I/O for PCA module 0
P1.4: Input/Output
CEX1: Capture/Compare External I/O for PCA module 1
P1.5: Input/Output
CEX2: Capture/Compare External I/O for PCA module 2
P1.6: Input/Output
CEX3: Capture/Compare External I/O for PCA module 3
P1.7: Input/Output:
CEX4: Capture/Compare External I/O for PCA module 4
Crystal 1: Input to the inverting oscillator amplifier and input to the internal clock
generator circuits.
Crystal 2: Output from the inverting oscillator amplifier
4 AT80C51RD2/AT83C51Rx2
4113B–8051–03/05
Share Link: 