參數(shù)資料
型號(hào)： NT6868AH
廠商： Electronic Theatre Controls, Inc.
英文描述： Keyboard Controller
中文描述： 鍵盤(pán)控制器
文件頁(yè)數(shù)： 2/14頁(yè)
文件大?。?/td> 205K
代理商： NT6868AH
NT6868A
2
Block Diagram
WATCH DOG
TIMER
6502
CPU
4K BYTES
ROM
128 BYTES
SRAM + STACK
BASE TIMER
INT. CONTROLLER
TIMING GENERATOR
(RC OSC/CERAMIC RESONATOR:
4MHz)
POWER-ON RESET/
LOW VOLTAGE RESET
I/O PORTS
GND
DATA
CLK
LED0
LED1
LED2
P00 - P07
P10 - P17
P30 - P34
P20 - P27
V
DD
RESET
Pin and Pad Descriptions
Pin No.
1
2
3
Pad No.
1
2
3
Designation
GND
NC
DATA
I/O
P
-
I/O
Description
Ground pin
No connection, recommended to connect V
DD
or floating
I/O, 10K
pull-up resistor for communication
I/O, 10K
pull-up resistor for communication
Bi-directional I/O pins
4
4
CLK
I/O
5 - 9,
11 - 34
10
5 - 9,
11 - 34
10
P30 - P34,
P00 - P27
I/O
RESET
LED0 -
LED2
I
RESET
signal input pin with internal pull up resistor; Active low
LED direct sink pins
35 - 37
35 - 37
O
38
38
V
DD
P
Power supply
39
39
R/OSCO
I
47K
resistor connected for RC OSC or 4MHz ceramic resonator
connected
No connection for RC OSC, connected for 4MHz ceramic
resonator
40
40
OSCI
-
* Under the constraint of the maximum frequency variation, (
F/F)
max
,
≤
±
1%, code 3 (ceramic resonator option) must be
selected and pin 39 and pin 40 are connected to a ceramic resonator. If (
F/F)
max
,
≤
±
10%, code 1 (RC OSC option) is
recommended to be selected and pin39 connects a 47K
resistor with,
≤
±
1% accuracy to V
DD
and pin 40 is floating.
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PDF描述
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