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68HC05PL4 데이터시트(PDF) 45 Page - Freescale Semiconductor, Inc

부품명 68HC05PL4
상세설명  Industry standard 8-bit M68HC05 CPU core
PDF  98 Pages
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제조업체  FREESCALE [Freescale Semiconductor, Inc]
홈페이지  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

68HC05PL4 데이터시트(HTML) 45 Page - Freescale Semiconductor, Inc

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April 30, 1998
GENERAL RELEASE SPECIFICATION
MC68HC05PL4
INPUT/OUTPUT PORTS
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
Data Direction
Register Bit
Data
Register Bit
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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