參數(shù)資料
型號: MC68HC705PD6
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PQFP80
封裝: QFP-80
文件頁數(shù): 116/165頁
文件大?。?/td> 841K
代理商: MC68HC705PD6
GENERAL RELEASE SPECIFICATION
July 7, 1997
MOTOROLA
INPUT/OUTPUT PORTS
MC68HC05PD6
7-4
REV 1.1
On reset, all Port D outputs are disconnected from the pins and the Port D data
latches are set to 1.
The pin connections of the lower 4-bits of Port D depend on the LCD duty
selection by the DUTYS bit in the LCDCR. When the LCD duty is not “1/4”, the
unused Backplanes driver(s) is (are) replaced by the Port D output pin(s)
automatically.
If DWOMH or DWOML bits in the WOM1 register is set, the P-channel drivers of
output buffers at the upper 4 bits or lower 3 bits, respectively are disabled (open
drain mode). This open drain controls do not apply to the pins which are
congured as Frontplanes or Backplanes driver outputs.
7.4.1 Port D MUX Register (PDMUX)
When PDM
x is set, the corresponding pin, PDx, is congure to port D output.
When PDM
x is clear, the corresponding pin, PDx, is congure to LCD output.
7.5
PORT E
Port E pins serve one of two basic functions depending on the MCU mode
selected: LCD Frontplanes driver outputs, or general purpose output pins. Since
Port E is an output only port there is no DDRE register.In place of DDRE is Port E
MUX Control Register (PEMUX). Bits 7-0 of this register control the Port/LCD
muxing of Port E bits 7-0 respectively on a bit-wide basis. These bits are cleared
on reset, and writing a 1 to any bit will turn that pin into a Port output. These
outputs have the capability to drive 10 mA sink current when (VOL
≤ Vss + 0.8V).
On reset, all Port E outputs are disconnected from the pins and the Port E data
latches are set to 1.
If EWOMH or EWOML bits in the WOM1 register is set, the P-channel driver of
output buffers at the upper or lower 4 bits, respectively, are disabled (open drain
mode). This open drain controls do not apply to the pins which are congured as
Frontplanes driver outputs.
W
R
PDMUX
$0003
reset
PDM7
0
7
00
54
0
0000
6
3210
PDM6
PDM4
PDM5
0
00
0
option
map
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