參數(shù)資料
型號: MC68HC05PL4CSD
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.56 MHz, MICROCONTROLLER, PDSO28
封裝: SSOP-28
文件頁數(shù): 40/98頁
文件大?。?/td> 1019K
代理商: MC68HC05PL4CSD
April 30, 1998
GENERAL RELEASE SPECIFICATION
MC68HC05PL4
INPUT/OUTPUT PORTS
MOTOROLA
REV 2.0
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
Inter
nal
Data
Bus
Data Direction
Register Bit
Data
Register Bit
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