參數資料
型號: HC05K3GRS
英文描述: 68HC05K3 General Release Specification
中文描述: 68HC05K3一般版本規(guī)范
文件頁數: 61/132頁
文件大小: 1188K
代理商: HC05K3GRS
Parallel Input/Output (I/O)
Port A
MC68HC05K3 — Revision 4.0
TechnicalData
MOTOROLA
Parallel Input/Output (I/O)
61
The port A data register is located at address $0000. The port A data
direction register (DDRA) is located at address $0004. The port A
pulldownregister(PDRA)islocatedataddress$0010.Resetclearsboth
the DDRA and the PDRA. The port A data register is unaffected by reset.
7.3.1 Port A Data Register
Each port A I/O pin has a corresponding bit in the port A data register.
When a port A pin is programmed as an output, the state of the
corresponding data register bit determines the state of the output pin.
When a port A pin is programmed as an input, any read of the port A data
registerreturnsthelogicstateofthecorrespondingI/Opin,andanywrite
to the port A data register is saved in the data register, but is not applied
to the corresponding I/O pin. The port A data register is unaffected by
reset. The port A data register is indeterminant after initial power-up.
7.3.2 Port A Data Direction Register
Each port A I/O pin may be programmed as an input by clearing the
corresponding bit in the DDRA or programmed as an output by setting
the corresponding bit in the DDRA. When a DDRA bit is set, the
corresponding pulldown device is disabled. The DDRA can be accessed
at address $0004. The DDRA is cleared by reset.
7.3.3 Port A Pulldown Inhibit Register
All port A I/O pins have software programmable pulldown devices which
may be enabled by a mask option. If enabled by mask option, the
software programmable pulldowns are activated by clearing their
corresponding bit in the PDRA or disabled by setting the corresponding
bit in the PDRA. If disabled by a mask option, all pulldowns are disabled.
A pulldown on an I/O pin can be activated only if the I/O pin is
programmed as an input.
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