參數(shù)資料
型號(hào): MC68HC05K3CDWR2
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PDSO16
封裝: SOIC-16
文件頁數(shù): 95/132頁
文件大小: 1188K
代理商: MC68HC05K3CDWR2
Parallel Input/Output (I/O)
Port B
MC68HC05K3 — Revision 4.0
Technical Data
MOTOROLA
Parallel Input/Output (I/O)
65
7.4.2 Port B Data Direction Register
Each port B I/O pin may be programmed as an input by clearing the
corresponding bit in the DDRB or programmed as an output by setting
the corresponding bit in the DDRB. When a DDRB bit is set, the
corresponding pulldown device is disabled. The DDRB can be accessed
at address $0005. Unused bits 2–7 are always read as logic 0s, and any
write to these bits is ignored. The DDRB is cleared by reset.
7.4.3 Port B Pulldown Inhibit Register
Each port B I/O pin has a software programmable pulldown device which
can be enabled by a mask option. If enabled by a mask option, the
software programmable pulldowns are activated by clearing the
corresponding bit in the PDRB or disabled by setting the corresponding
bit in the PDRB. 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.
The PDRB is a write-only register and any reads of location $0011 return
undefined results. Since reset clears both the DDRB and the PDRB, all
pins initialize as inputs with the pulldown devices active (if enabled by
mask option).
Address:
$0011
Bit 7
654321
Bit 0
Read:
Write:
PDIB1
PDIB0
Reset:
0
= Unimplemented
Figure 7-4. Port B Pulldown Inhibit Register (PDRB)
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