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參數(shù)資料
| 型號： | MC68HC11K1 |
| 廠商： | Motorola, Inc. |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8-Bit Microcontroller(8位微控制器) |
| 中文描述： | 8位微控制器（8位微控制器） |
| 文件頁數(shù)： | 11/20頁 |
| 文件大?。?/td> | 286K |
| 代理商： | MC68HC11K1 |
AN1242/D
MOTOROLA
11
module K4_TO_PSD_CONVERSION
title 'MC68HC711K4 to MC68HC11K1 + PSD412A1 Conversion'
"The following section lists the input signals.
"First come the address lines using their reserved names. Note that only those signals
"listed are routed to the DPLD.
a15,a14,a13,a12,a11,a10,a9,a8,a1,a0 pin;
"Next come the general purpose inputs used for the paging scheme. Uncomment the lines
"implementing the desired paging. For this application, the PSD page register will be
used
"because it requires no additional I/O pins. The K1 memory expansion address lines may be
"used if additional address bits or the page register inputs are required for specific
"decoding purposes. Use of the page register will be discussed later.
pgr3,pgr2,pgr1,pgr0 pin; "These are the 4 input bits of the PSD page register.
xapage pin 20; "This is XA14 from the MC68HC11K1 and is used to select one of the 16K LCD
"data table pages.
"The M68HC11 non-multiplexed bus control signals are specified here.
rd_wr,e pin 29,41; "M68HC11 R/W* and E specified here as PSD pins 29 (WR) and 41 (RD).
"Now the DPLD chip select outputs are listed.
"CSIOP is the chip select for the PSD register block.
"RS0 is the chip select for the 2K PSD SRAM.
"ES[0:3] are the chip selects for PSD EPROM blocks 0, 1, 2, and 3.
csiop,rs0,es0,es1,es2,es3 node;
"Signal definitions and groupings now follow.
X = .x.; "This is how a don't care term is specified.
"This definition groups together the CPU address lines.
CPUaddress = [a15,a14,a13,a12,a11,a10,a9,a8,X,X,X,X,X,X,a1,a0];
"This definition groups together the page register bits.
PAGE = [pgr3,pgr2,pgr1,pgr0];
"DPLD Chip Select Equations.
"This maps the PSD register block from $2800 to $28FF.
csiop = (CPUaddress >= ^h2800) & (CPUaddress <= ^h28FF);
"This maps the PSD 2K SRAM from $2000 to $27FF.
rs0 = (CPUaddress >= ^h2000) & (CPUaddress <= ^h27FF);
"This maps 16K PSD EPROM block 3 from $C000 to $FFFF.
es3 = (CPUaddress >= ^hC000) & (CPUaddress <= ^hFFFF);
"This maps 16K PSD EPROM block 2 from $8000 to $BFFF.
es2 = (CPUaddress >= ^h8000) & (CPUaddress <= ^hBFFF);
"This maps 16K PSD EPROM block 1 from $4000 to $7FFF when XA14 is logic one, i.e. this
is LCD
"data table page 1. Use this equation when the K1 memory expansion is used in place of the
"PSD page register.
"es1 = xapage & (CPUaddress >= ^h4000) & (CPUaddress <= ^h7FFF);
"This maps 16K PSD EPROM block 1 from $4000 to $7FFF when PAGE = $1, i.e. this is LCD
"data table page 1. Do not use this equation if the K1 memory expansion is being used.
es1 = (PAGE == ^h1) & (CPUaddress >= ^h4000) & (CPUaddress <= ^h7FFF);
"This maps 16K PSD EPROM block 0 from $4000 to $7FFF when XA14 is logic zero, i.e. this
is LCD
"data table page 0. Use this equation when the K1 memory expansion is used in place of the
"PSD page register.
"es0 = !xapage & (CPUaddress >= ^h4000) & (CPUaddress <= ^h7FFF);
"This maps 16K PSD EPROM block 0 from $4000 to $7FFF when PAGE = $0, i.e. this is LCD
"data table page 0. Do not use this equation if the K1 memory expansion is being used.
es0 = (PAGE == ^h0) & (CPUaddress >= ^h4000) & (CPUaddress <= ^h7FFF);
end K4_TO_PSD_CONVERSION
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