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AT89S51_05 データシート(Datasheet) 4 Page - ATMEL Corporation

部品番号. AT89S51_05
部品情報  8-bit Microcontroller with 4K Bytes In-System Programmable Flash
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メーカー  ATMEL [ATMEL Corporation]
ホームページ  http://www.atmel.com
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4
2487C–MICRO–03/05
AT89S51
4.
Pin Description
4.1
VCC
Supply voltage (all packages except 42-PDIP).
4.2
GND
Ground (all packages except 42-PDIP; for 42-PDIP GND connects only the logic core and the
embedded program memory).
4.3
VDD
Supply voltage for the 42-PDIP which connects only the logic core and the embedded program
memory.
4.4
PWRVDD
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.
4.5
PWRGND
Ground for the 42-PDIP which connects only the I/O Pad Drivers. PWRGND and GND are
weakly connected through the common silicon substrate, but not through any metal link. The
application board MUST connect both GND and PWRGND to the board ground.
4.6
Port 0
Port 0 is an 8-bit open drain bi-directional I/O port. As an output port, each pin can sink eight TTL
inputs. When 1s are written to port 0 pins, the pins can be used as high-impedance inputs.
Port 0 can also be configured to be the multiplexed low-order address/data bus during accesses
to external program and data memory. In this mode, P0 has internal pull-ups.
Port 0 also receives the code bytes during Flash programming and outputs the code bytes dur-
ing program verification. External pull-ups are required during program verification.
4.7
Port 1
Port 1 is an 8-bit bi-directional I/O port with internal pull-ups. The Port 1 output buffers can
sink/source four TTL inputs. When 1s are written to Port 1 pins, they are pulled high by the inter-
nal pull-ups and can be used as inputs. As inputs, Port 1 pins that are externally being pulled low
will source current (IIL) because of the internal pull-ups.
Port 1 also receives the low-order address bytes during Flash programming and verification.
Port Pin
Alternate Functions
P1.5
MOSI (used for In-System Programming)
P1.6
MISO (used for In-System Programming)
P1.7
SCK (used for In-System Programming)




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