參數(shù)資料
型號： MC68HC705L16CFU
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： PLASTIC, QFP-80
文件頁數(shù)： 146/146頁
文件大?。?/td> 852K
代理商： MC68HC705L16CFU
Backplane Driver and Port Selection
MC68HC05L16 MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
99
10.3 Backplane Driver and Port Selection
The number of backplane (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. (See Table 10-1.)
10.4 Frontplane Driver and Port Selection
The number of frontplane (FP) pins depends on the number of port D and port E bits. If port bits are
selected as a parallel output port, the number of the FP pins is decreased to 27 as a minimum. The
selections between frontplane and port (nibble wide) are done by the PEH, PEL, and PDH bits in the
LCDCR (see Table 10-2). These bits also can be controlled on a bit-wide basis by using the PDMUX and
PEMUX registers. PDH, PEH, and PEL have priority over the mux registers. On reset, port D and port E
bits are disconnected and FP27–FP38 pins output VDD levels.
Table 10-1. Backplane and Port Selection
Duty
LCD Control
Pin Selection
DUTY1
DUTY0
BP3/PD3
BP2/PD2
BP1/PD1
BP0
1 / 10
1PD3
PD2
PD1
BP0
1 / 2
1
0
PD3
PD2
BP1
BP0
1 / 3
1
PD3
BP2
BP1
BP0
1 / 4
0
BP3
BP2
BP1
BP0
Table 10-2. Frontplane and Port Selection
FP / Port Control
Port Selection
PEH
PEL
PDH
PDMx
PEMx
FP27:FP30/
PE7:PE4
FP31:FP34/
PE3:PE0
FP35:FP38/
PD7:PD4
00
FP35:FP38
01
Varied
1
X
PD7:PD4
00
FP31:FP34
01
Varied
1
X
PE3:PE0
00
FP27:FP30
01
1
Varied
1
X
PE7:PE4
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