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參數(shù)資料
| 型號： | μPD78P0208 |
| 廠商： | NEC Corp. |
| 英文描述： | 8 Bit Single Chip Microcontrollers(8位單片微控制器) |
| 中文描述： | 8位單片機微控制器（8位單片微控制器） |
| 文件頁數(shù)： | 11/72頁 |
| 文件大?。?/td> | 424K |
| 代理商： | ΜPD78P0208 |
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11
m
PD78P0208
1. DIFFERENCES BETWEEN THE
m
PD78P0208 AND MASK ROM PRODUCTS
The
m
PD78P0208 contains an on-chip one-time PROM in which data can be written once or an EPROM featuring
repetitive program write and deletion.
Functions other than PROM specifications and mask options can be set as equivalent to those of mask ROM
products, by setting the internal memory switching register (IMS) and internal expansion RAM switching register (IXS)
accordingly.
Table 1-1 lists the points of difference between the
m
PD78P0208 and mask ROM products.
Table 1-1 Differences between
m
PD78P0208 and Mask ROM Products
Notes 1.
A RESET input sets the internal PROM capacity to 60K bytes.
2.
A RESET input sets the internal expansion RAM capacity to 1024 bytes.
Item
Mask ROM products
m
PD78P0208
ROM structure
ROM capacity
Internal expansion RAM capacity
Changing the internal ROM capacity
using the internal memory switching
register (IMS)
Changing the internal expansion
RAM capacity using the internal
expansion RAM switching register
(IXS)
Includes IC pins
Includes V
PP
pins
P30/TO0-P32/TO2,P33/TI1
P34/TI2, P35/PCL, P36/BUZ, P37
P70-P74
FIP0-FIP12
P80/FIP13-P87/FIP20
P90/FIP21-P97/FIP28
P100/FIP29-P107/FIP36
P110/FIP37-P117/FIP44
P120/FIP45-P127/FIP52
Electrical characteristics
One-time PROM/EPROM
60K bytes
1024 bytes
Possible
Note 1
Possible
Note 2
No
Yes
No on-chip pull-down resistors
No on-chip pull-up resistors
On-chip pull-down resistors provided
(connect to V
LOAD
)
No on-chip pull-down resistors
Refer to the data sheet of each product.
Mask ROM
m
PD780204 :
m
PD780205 :
m
PD780206 :
m
PD780208 :
32K bytes
40K bytes
48K bytes
60K bytes
m
PD780204 :
m
PD780205 :
m
PD780206 :
m
PD780208 :
None
None
1024 bytes
1024 bytes
Impossible
Impossible
Yes
No
An on-chip pull-down resistor can be
incorporated for each pin by specifying
mask options.
An on-chip pull-up resistor can be
incorporated for each pin by specifying
mask options.
An on-chip pull-down resistor can be
incorporated for each pin by specifying
mask options.
An on-chip pull-down resistor can be
incorporated for each pin by specifying
mask options. (These pins can be
connected to V
LOAD
or V
SS
in four-bit
units.)
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