參數(shù)資料
型號: 68HC05PL4
廠商: Motorola, Inc.
英文描述: 8-Bit Microcontroller Units (MCU).(8位微控制器)
中文描述: 8位微控制器單元(MCU)。(8位微控制器)
文件頁數(shù): 45/98頁
文件大?。?/td> 1019K
代理商: 68HC05PL4
April 30, 1998
GENERAL RELEASE SPECIFICATION
MC68HC05PL4
REV 2.0
INPUT/OUTPUT PORTS
MOTOROLA
7-1
SECTION 7
INPUT/OUTPUT PORTS
This section describes the general purpose I/O ports on the MC68HC05PL4 and
MC68HC05PL4B MCUs.
In the MC68HC05PL4, 23 bidirectional I/O lines are available, arranged as one
7-bit I/O port (Port A), one 8-bit I/O port (Port B), and one 8-bit I/O port (Port C).
In the MC68HC05PL4B, 22 bidirectional I/O lines are available, arranged as one
6-bit I/O port (Port A), one 8-bit I/O port (Port B), and one 8-bit I/O port (Port C).
NOTE
To avoid generating a glitch on an I/O port pin, data should be written to the I/O
port data register before writing a “1” (for output) to the corresponding data
direction register.
7.1
PARALLEL PORTS
Port A, B, and C are bidirectional ports. Each port pin is controlled by the
corresponding bits in a data direction register and a data register as shown in
Figure 7-1
. The functions of the I/O pins are summarized in
Table 7-1
.
Figure 7-1. Port Input/Output Circuitry
I/O PIN
OUTPUT
RESET
(RST)
Read Data
Write Data
Read/Write DDR
I
Data Direction
Register Bit
Data
Register Bit
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