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參數(shù)資料
| 型號(hào)： | NT6868A |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Keyboard Controller |
| 中文描述： | 鍵盤控制器 |
| 文件頁(yè)數(shù)： | 4/14頁(yè) |
| 文件大?。?/td> | 205K |
| 代理商： | NT6868A |
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NT6868A
4
System Reserved Registers
Address
Register
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
$00C0
BT
BT7
BT6
BT5
BT4
BT3
BT2
BT1
BT0
W
$00C1
TCON
-
-
-
-
-
-
-
ENBT
W
$00C2
CLRIRQX
-
-
-
-
-
-
-
CLRIRQTMR
W
$00C3
PORT0
PD07
PD06
PD05
PD04
PD03
PD02
PD01
PD00
RW
$00C4
PORT1
PD17
PD16
PD15
PD14
PD13
PD12
PD11
PD10
RW
$00C5
PORT2
PD27
PD26
PD25
PD24
PD23
PD22
PD21
PD20
RW
$00C6
PORT3
-
-
-
PD34
PD33
PD32
PD31
PD30
RW
$00C7
CLK
-
-
-
-
-
-
-
CLK
RW
$00C8
DATA
-
-
-
-
-
-
-
DATA
RW
$00C9
LED
-
-
-
-
-
LED2
LED1
LED0
W
$00CA
CLRWDT
0
1
0
1
0
1
0
1
W
$00CB
X
X
X
X
X
X
X
X
X
X
$00CC
X
X
X
X
X
X
X
X
X
X
$00CD
X
X
X
X
X
X
X
X
X
X
$00CE
X
X
X
X
X
X
X
X
X
X
$00CF
X
X
X
X
X
X
X
X
X
X
- : no effect
X : access not allowed
4K X 8 ROM
The built-in ROM program code, executed by the 6502
CPU, has a capacity of 4K X 8 bits and is addressed
from F000H to FFFFH.
128 X 8 SRAM
The built-in SRAM is used for general purpose data
memory and for the stack area. SRAM is addressed from
0000H to 007FH. User can allocate stack area in the
SRAM by setting stack pointer register (S). Because the
6502C default stack pointer is 01FFH, it must be
mapped to 007FH. Mapping from 01XX to 00XX is done
internally by setting the S register to 7FH via software
programming.
For example :
LDX #$7F
TXS
Power-On Reset
Built-in power-on reset circuit can generate a 150ms
pulse to reset the entire chip. The beginning of the
150ms pulse occurs at 60% of V
DD
when powered on.
The start of 150ms pulse
V
DD
t
power
60%
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| NT6868A-0011 | Keyboard Controller |
| NT6868A-10100 | Keyboard Controller |
| NT6868AH | Keyboard Controller |
| NT6868AH-0046 | Keyboard Controller |
| NT6868AH-10088 | Keyboard Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NT6868A-0011 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Keyboard Controller |
| NT6868A-10100 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Keyboard Controller |
| NT6868AH | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Keyboard Controller |
| NT6868AH-0046 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Keyboard Controller |
| NT6868AH-10088 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Keyboard Controller |
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