參數(shù)資料
型號: μPD750100
廠商: NEC Corp.
英文描述: 32 Bit Single Chip Microcontrollers(32位單片微控制器)
中文描述: 32位單片機微控制器(32位單片微控制器)
文件頁數(shù): 7/66頁
文件大?。?/td> 417K
代理商: ΜPD750100
μ
PD705100
7
1. PIN FUNCTIONS
1.1 Pin Functions
Pin name
Input/output
Function
At hold
At reset
A2-A27
Tristate output
Address bus
Hi-Z
H
A28-A31/CS0-CS3
Note
Address bus/chip select
Hi-Z/H
H
D0-D31
Tristate input/output
Bidirectional data bus
Hi-Z
Hi-Z
BE0, BE1
Tristate output
Indicates which data bus can be used
for data access.
Hi-Z
H
BE2/BH
Indicates access to D16-D23/byte or
halfword access.
Hi-Z
H
BE3/A1
Indicates most significant byte access/A1
address.
Hi-Z
H
ST0-ST3
Indicates the status of a bus.
Hi-Z
0101
BCYST
Indicates the start of a bus cycle.
Hi-Z
H
R/W
Indicates whether the bus cycle is
a read or write cycle.
Hi-Z
H
READY
Input
Terminates a bus cycle.
-
-
HLDRQ
Requests bus mastership.
-
-
HLDAK
Output
Response to HLDRQ
L
H
SIZ16B
Input
Fixes the bus width to 16 bits.
-
-
NMI
Nonmaskable interrupt request
-
-
INT
Maskable interrupt request
-
-
INTV0-INTV3
Indicates an interrupt level.
-
-
BCLK
Bus clock input
-
-
CMODE
Specifies the frequency ratio for the
external bus and the internal circuit.
-
-
ASEL
Selects A28-A31/CS0-CS3.
-
-
RESET
Resets the internal state.
-
-
V
DD
-
Supplies positive power.
-
-
GND
Ground potential
-
-
Note
When used for a chip select signal, this is held at the high level.
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