參數(shù)資料
型號: MC68HC05P18ADWE
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封裝: SOIC-28
文件頁數(shù): 85/130頁
文件大?。?/td> 1310K
代理商: MC68HC05P18ADWE
NON-DISCLOSURE
AGREEMENT
REQUIRED
Input/Output (I/O) Ports
Technical Data
MC68HC05P18A
Input/Output (I/O) Ports
7.5 Port C
Port C is an 8-bit bidirectional port that can share pins PC3–PC7 with the
analog-to-digital (A/D) converter subsystem. The port C data register is
located at address $0002 and its data direction register (DDR) is located
at address $0006. Reset does not affect the data registers, but clears the
DDRs, thereby setting all of the port pins to input mode. Writing a 1 to a
DDR bit sets the corresponding port pin to output mode (see
Figure 7-3). Two port C pins, PC0 and PC1, can source and sink a
higher current than a typical I/O pin. See Section 13. Electrical
Specifications regarding current specifications.
Port C may be used for general I/O applications when the A/D
subsystem is disabled. The ADON bit in the A/D status and control
register (ADSC) is used to enable/disable the A/D subsystem.
CAUTION:
Care must be exercised when using pins PC0–PC2 while the A/D
subsystem is enabled. Accidental changes to bits that affect pins
PC3–PC7 in the data or DDR registers will produce unpredictable results
in the A/D subsystem.
Figure 7-3. Port C I/O Circuitry
READ $0002
WRITE $0002
READ $0006
DATA
REGISTER BIT
I/O
PIN
OUTPUT
INTERNAL HC05
DATA BUS
RESET
(RST)
WRITE $0006
DATA DIRECTION
REGISTER BIT
HIGH CURRENT
CAPABILITY, PC0
AND PC1 ONLY
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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