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參數(shù)資料
| 型號： | UPD77016 |
| 廠商： | NEC Corp. |
| 元件分類： | 數(shù)字信號處理 |
| 英文描述： | 16 bits, Fixed-point Digital Signal Processor |
| 中文描述： | 16位定點數(shù)字信號處理器 |
| 文件頁數(shù)： | 10/56頁 |
| 文件大?。?/td> | 250K |
| 代理商： | UPD77016 |
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μ
PD77016
10
External data memory interface
Symbol
Pin No.
I/O
Function
X/Y
20
O
Memory select signal output
0: X memory is used.
1: Y memory is used.
(3S)
DA15 - DA0
Note 1.
O
Address bus to external data memory
External data memory is accessed.
During the external memory is not accessed, these pins
keep the previous level.
These pins are set to low level; 0x0000, by reset.
They continue outputting low level until the first external
memory access.
(3S)
D15 - D0
Note 2.
I/O
(3S)
16 bits data bus to external data memory
External data memory is accessed.
MRD
17
O
Read output
Reads external memory
(3S)
MWR
16
O
Write output
Writes external memory
(3S)
WAIT
6
I
Wait signal input
1: No wait
0: Wait
Wait cycle is input when external memory is read.
HOLDRQ
7
I
Hold request signal input
Input low level when external data memory bus is
expected to use.
BSTB
18
O
Bus strobe signal output
Outputs low level while the
μ
PD77016 is occupying
external memory bus.
HOLDAK
19
O
Hold acknowledge signal output
Outputs low level when the
μ
PD77016 permits external
device to use external data memory bus.
Note 1.
DA15 to DA0 pins are located on Pin No. 21 - 24, 27 - 34, 37 - 40.
D15 to D0 pins are located on Pin No. 41 - 44, 47 - 54, 57 - 60.
2.
Remark
The state of the pins added 3S becomes high impedance when the external memory is not accessed or bus release signal
(HOLDAK = 0) is output.
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