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): 4/165頁
文件大小: 841K
代理商: MC68HC705PD6
July 7, 1997
GENERAL RELEASE SPECIFICATION
MC68HC05PD6
LCD DRIVER
MOTOROLA
REV 1.1
10-5
10.3
BACKPLANE DRIVER AND PORT SELECTION
The number of Backplanes (Port D) pins depends on the LCD duty. It is automatically
selected by DUTY1 and DUTY0 bits in the LCD Control Register (LCDCR). On reset,
these bits are cleared and 1/4 duty is selected.
10.4
LCD CONTROL REGISTER (LCDCR)
LCDE – LCD Output Enable
The LCDE bit enables all BP and FP outputs. This bit is cleared on reset.
0 =
Ports that congure as BP and FP pins will output Vdd.
1 =
all BP and FP pins output LCD waveform
DUTYS – LCD Duty Select
The DUTYS bits select the duty of LCD driver as shown in Table 10-1. The
number of BP pins is related to this duty selection. The unused BP pin is used
as Port D pin. Default duty is 1/4 duty. These bits are cleared on reset.
DUTYOF – LCD Duty Disable
0 =
LCD Duty is enable. The number of BP pins is determined by
DUTYS.
1 =
LCD Duty is disable. BP0 - BP3 are replaced by PD0 - PD3
respectively regardless the selection of LCD duty.
FC, LC – Fast Charge, Low Current
These bits are used to select resistor values in the voltage generator resistor
chain. Reset clears these bits.
Table 10-1. Backplanes and Port Selection
DUTY
LCD CONTROL
PIN SELECTION
DUTYS
BP3/PD3
BP2/PD2
BP1/PD1
BP0/PD0
1/3
1
PD3
BP2
BP1
BP0
1/4
0
BP3
BP2
BP1
BP0
0
7
0000000
6543210
W
R
LCDCR
$0020
reset
LCDE
0
DUTYS
DUTYOF
0
FC
LC
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