參數(shù)資料
型號: ATWEBDVK-02VOIP
廠商: Atmel
文件頁數(shù): 13/137頁
文件大?。?/td> 0K
描述: KIT DEV TCP/IP AT89C51RD2 VOIP
標準包裝: 1
系列: @Web
主要目的: *
嵌入式: *
已用 IC / 零件: AT89C51RD2
主要屬性: *
次要屬性: *
已供物品: 板,帶 VoIP 模塊和軟件
產品目錄頁面: 617 (CN2011-ZH PDF)
11
4235K–8051–05/08
AT89C51RD2/ED2
Table 4-1.
Pin Description
Mnemonic
Pin Number
Type
Name and Function
PLCC44 VQFP44
PLCC68
VQFP64
VSS
22
16
51
40
I
Ground: 0V reference
V
CC
44
38
17
8
I
Power Supply: This is the power supply voltage for normal, idle and
power-down operation
P0.0 - P0.7
43 - 36
37 - 30
15, 14,
12, 11,
9,6, 5, 3
6, 5, 3, 2,
64,
61,60,59
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 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.
P1.0 - P1.7
2 - 9
40 - 44
1 - 3
19, 21,
22, 23,
25, 27,
28, 29
10, 12,
13, 14,
16, 18,
19, 20
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 AT89C51RD2/ED2 Port 1 include:
2
40
19
10
I/O
P1.0: Input/Output
I/O
T2 (P1.0): Timer/Counter 2 external count input/Clockout
3
41
21
12
I/O
P1.1: Input/Output
I
T2EX: Timer/Counter 2 Reload/Capture/Direction Control
I
SS: SPI Slave Select
4
42
22
13
I/O
P1.2: Input/Output
I
ECI: External Clock for the PCA
5
43
23
14
I/O
P1.3: Input/Output
I/O
CEX0: Capture/Compare External I/O for PCA module 0
6
44
25
16
I/O
P1.4: Input/Output
I/O
CEX1: Capture/Compare External I/O for PCA module 1
7
1
27
18
I/O
P1.5: Input/Output
I/O
CEX2: Capture/Compare External I/O for PCA module 2
I/O
MISO: SPI Master Input Slave Output line
When SPI is in master mode, MISO receives data from the slave
peripheral. When SPI is in slave mode, MISO outputs data to the master
controller.
8
2
28
19
I/O
P1.6: Input/Output
I/O
CEX3: Capture/Compare External I/O for PCA module 3
I/O
SCK: SPI Serial Clock
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