參數(shù)資料
型號: MC68HLC705KJ1CDWR2
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PDSO16
封裝: SOIC-16
文件頁數(shù): 129/144頁
文件大小: 1377K
代理商: MC68HLC705KJ1CDWR2
Parallel I/O Ports
Port A
MC68HC705KJ1 — Rev. 2.0
Technical Data
MOTOROLA
Parallel I/O Ports
85
7.3.3 Pulldown Register A
Pulldown register A inhibits the pulldown devices on port A pins
programmed as inputs.
NOTE:
If the SWPDI bit in the mask option register is programmed to logic 1,
reset initializes all port A pins as inputs with disabled pulldown devices.
PDIA[7:0] — Pulldown Inhibit A Bits
PDIA[7:0] disable the port A pulldown devices. Reset clears
PDIA[7:0].
1 = Corresponding port A pulldown device disabled
0 = Corresponding port A pulldown device not disabled
7.3.4 Port LED Drive Capability
All outputs can drive light-emitting diodes (LEDs). These pins can sink
approximately 10 mA of current to VSS.
Table 7-1. Port A Pin Operation
Data Direction Bit
I/O Pin Mode
Accesses to Data Bit
Read
Write
0
Input, high-impedance
Pin
Latch(1)
1. Writing affects the data register but does not affect input.
1
Output
Latch
Address:
$0010
Bit 7
654321
Bit 0
Read:
Write:
PDIA7
PDIA6
PDIA5
PDIA4
PDIA3
PDIA2
PDIA1
PDIA0
Reset:
00000000
= Unimplemented
Figure 7-5. Pulldown Register A (PDRA)
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