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AT89LV55-12PI Fiches technique(PDF) 4 Page - ATMEL Corporation

No de pièce AT89LV55-12PI
Description  8-bit Microcontroller with 20K Bytes Flash
Download  32 Pages
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Fabricant  ATMEL [ATMEL Corporation]
Site Internet  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89LV55-12PI Fiches technique(HTML) 4 Page - ATMEL Corporation

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4
0811D–MICRO–3/06
AT89LV55
4.
Pin Description
4.1
V
CC
Supply voltage.
4.2
GND
Ground.
4.3
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 pullups.
Port 0 also receives the code bytes during Flash programming and outputs the code bytes dur-
ing program verification. External pullups are required during program verification.
4.4
Port 1
Port 1 is an 8-bit bi-directional I/O port with internal pullups. 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 pullups and can be used as inputs. As inputs, Port 1 pins that are externally being pulled low
will source current (I
IL) because of the internal pullups.
In addition, P1.0 and P1.1 can be configured to be the timer/counter 2 external count input
(P1.0/T2) and the timer/counter 2 trigger input (P1.1/T2EX), respectively, as shown in the follow-
ing table.
Port 1 also receives the low-order address bytes during Flash programming and verification.
4.5
Port 2
Port 2 is an 8-bit bi-directional I/O port with internal pullups. The Port 2 output buffers can
sink/source four TTL inputs. When 1s are written to Port 2 pins, they are pulled high by the inter-
nal pullups and can be used as inputs. As inputs, Port 2 pins that are externally being pulled low
will source current (I
IL) because of the internal pullups.
Port 2 emits the high-order address byte during fetches from external program memory and dur-
ing accesses to external data memory that use 16-bit addresses (MOVX @ DPTR). In this
application, Port 2 uses strong internal pullups when emitting 1s. During accesses to external
data memory that use 8-bit addresses (MOVX @ RI), Port 2 emits the contents of the P2 Special
Function Register.
Port 2 also receives the high-order address bits and some control signals during Flash program-
ming and verification.
Port Pin
Alternate Functions
P1.0
T2 (external count input to Timer/Counter 2), clock-out
P1.1
T2EX (Timer/Counter 2 capture/reload trigger and direction control)


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