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AT89LP6440 bảng dữ liệu(PDF) 48 Page - ATMEL Corporation

tên linh kiện AT89LP6440
Giải thích chi tiết về linh kiện  8-bit Microcontroller with 64K Bytes In-System Programmable Flash
PDF  194 Pages
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nhà sản xuất  ATMEL [ATMEL Corporation]
Trang chủ  http://www.atmel.com
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AT89LP6440 bảng dữ liệu(HTML) 48 Page - ATMEL Corporation

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3706A–MICRO–9/09
AT89LP6440 - Preliminary
10.4
Port Alternate Functions
Most general-purpose digital I/O pins of the AT89LP6440 share functionality with the various
I/Os needed for the peripheral units. Table 10-6 lists the alternate functions of the port pins.
Alternate functions are connected to the pins in a logic AND fashion. In order to enable the
alternate function on a port pin, that pin must have a “1” in its corresponding port register bit,
otherwisethe input/output will always be “0”. However, alternate functions may be temporarily
forced to “0” by clearing the associated port bit, provided that the pin is not in input-only mode.
Furthermore, each pin must be configured for the correct input/output mode as required by its
peripheral before it may be used as such. Table 10-5 shows how to configure a generic pin for
use with an alternate function.
Table 10-5.
Alternate Function Configurations for Pin y of Port x
PxM0.y
PxM1.y
Px.y
I/O Mode
00
1
bidirectional (internal pull-up)
01
1
output
10
X
input
11
1
bidirectional (external pull-up)
Table 10-6.
Port Pin Alternate Functions
Port Pin
Configuration Bits
Alternate
Function
Notes
PxM0.y
PxM1.y
P0.0
P0M0.0
P0M1.0
AD0
Automatic configuration
ADC0
input-only
P0.1
P0M0.1
P0M1.1
AD1
Automatic configuration
ADC1
input-only
P0.2
P0M0.2
P0M1.2
AD2
Automatic configuration
ADC2
input-only
P0.3
P0M0.3
P0M1.3
AD3
Automatic configuration
ADC3
input-only
P0.4
P0M0.4
P0M1.4
AD4
Automatic configuration
ADC4
input-only
P0.5
P0M0.5
P0M1.5
AD5
Automatic configuration
ADC5
input-only
P0.6
P0M0.6
P0M1.6
AD6
Automatic configuration
ADC6
input-only
P0.7
P0M0.7
P0M1.7
AD7
Automatic configuration
ADC7
input-only
P1.0
P1M0.0
P1M1.0
T2
GPI0
P1.1
P1M0.1
P1M1.1
T2EX
GPI1



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