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NT6880H PDF даташит

Спецификация NT6880H изготовлена ​​​​«ETC» и имеет функцию, называемую «Keyboard Controller».

Детали детали

Номер произв NT6880H
Описание Keyboard Controller
Производители ETC
логотип ETC логотип 

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NT6880H Даташит, Описание, Даташиты
NT6880
Features
T Built-in 6502 8-bit CPU
T 2 MHz CPU operation frequency
T 5K bytes of ROM
T 160 bytes of SRAM
T One 8-bit programmable base timer with
1 - 256 µsec interval
T 29 programmable bi-directional I/O pins
T 3 LED direct sink pins
Keyboard Controller
T Mask optional for built-in RC oscillator with an
external resistor or external ceramic resonator applied
T Mask optional for DATA/CLK driving capability
T Watch-dog timer reset
T Built-in power-on reset
T Built-in low voltage reset
T CMOS technology for low power consumption
T Available in 40 pin DIP package and 40 pad Chip
Form
General Description
The NT6880 is a single chip micro-controller for
keyboard applications. It incorporates a 6502 8-bit CPU
core, 5K bytes of ROM and 160 bytes of RAM used as
working RAM and stack area. It also includes 29
programmable bi-directional I/O pins and one 8-bit pre-
loadable base timer. Additionally, it includes a built-in
low voltage reset, a 4MHz RC oscillator requiring an
externally applied resistor or a 4MHz ceramic resonator
and a watch-dog timer that prevents system standstill.
Pin Configuration
GND
NC
DATA
CLK
P30
P31
P32
P33
P34
RESET
P00
P01
P02
P03
P04
P05
P06
P07
P10
P11
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
40 OSCI
39 R/OSCO
38 VDD
37 LED2
36 LED1
35 LED0
34 P27
33 P26
32 P25
31 P24
30 P23
29 P22
28 P21
27 P20
26 P17
25 P16
24 P15
23 P14
22 P13
21 P12
Pad Configuration
PPPPPPPPPP
1111111100
7654321076
26 25 24 23 22 21 20 19 18 17
16 P05
15 P04
P20 27
14 P03
P21 28
13 P02
P22 29
12 P01
P23 30
P24 31
NT6880H
11 P00
10 RESET
P25 32
9 P34
P26 33
8 P33
P27 34
7 P32
LED0
LED1
35
36
37 38 39 40 1
2345
6 P31
LVR OG
E D / SN
D DO CD
2 SI
C
O
NDCP
CAL 3
TK0
A
1 V1.0









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NT6880H Даташит, Описание, Даташиты
Block Diagram
Timing Generator
(RC OSC/Ceramic Resonator: 4MHz)
5K Bytes
ROM
RESET
VDD
GND
6502
CPU
Interrupt
Controller
Power-On RESET/
Low Voltage RESET
160 Bytes
SRAM + STACK
Watch Dog
Timer
Base Timer
NT6880
I/O PORTs
CLK
DATA
LED0
LED1
LED2
P00 - P07
P10 - P17
P20 - P27
P30 - P34
Pin and Pad Descriptions
Pin No.
1
2
3
4
5 - 9,
11 - 34
10
35 - 37
38
39
Pad No.
1
2
3
4
5 - 9,
11 - 34
10
35 - 37
38
39
Designation
GND
NC
DATA
CLK
P30 - P34,
P00 - P27
RESET
LED0 -
LED2
VDD
R/OSCO
I/O
P
-
I/O
I/O
I/O
I
O
P
I
40 40
OSCI
-
Description
Ground pin
No connection, recommended to connect VDD or floating
I/O, 10Kpull-up resistor for communication
I/O, 10Kpull-up resistor for communication
Bi-directional I/O pins
RESET signal input pin with internal pull up resistor; Active low
LED direct sink pins
Power supply
47Kresistor connected for RC OSC or 4MHz ceramic resonator
connected
No connection for RC OSC connected for 4MHz ceramic resonator
* Under the constraint of the maximum frequency variation, (F/F)max, ≤ ±1%, code 3, 7 (ceramic resonator option) must
be selected and pin 39 and pin 40 must be connected to a ceramic resonator. If (F/F)max, ≤ ±10%, code 1, 5 (RC OSC
option) it is recommended that pin 39 be connected to a 47Kresistor with ≤ ±1% accuracy to VDD. Pin 40 is floating.
2









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NT6880H Даташит, Описание, Даташиты
Functional Description
1. 6502 CPU
The 6502 is an 8-bit CPU. Please refer to the 6502 data sheet for more details.
NT6880
70
ACCUMULATOR A
70
INDEX REGISTER X
70
INDEX REGISTER Y
0000
009F
00C0
00CF
SRAM
UNUSED
SYSTEM REGISTERS
STACK PTR
15
PROGRAM COUNTER PC
0
UNUSED
70
EC00
S STACK POINTER SP
7
SV
0
B D I Z C STATUS REGISTER P
CARRY
ZERO
INTERRUPT MASK
DECIMAL MODE
BREAK
OVERFOLW
SIGN
FFFA
FFFB
FFFC
FFFD
FFFE
FFFF
USER ROM
NMI-L
NMI-H
RST-L
RST-H
IRQ-L
IRQ-H
NMI VECTOR
IRQ VECTOR
Figure 1.1 6502 CPU Registers and Status Flags
Figure 1.2. NT6880 Memory Map
3










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Номер в каталогеОписаниеПроизводители
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