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參數(shù)資料
| 型號： | μPD78P048A |
| 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 |
| 文件大小： | 387K |
| 代理商： | ΜPD78P048A |
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m
PD78P048A
11
1.
DIFFERENCES BETWEEN
m
PD78P048A AND MASK ROM PRODUCTS
The
m
PD78P048A is a single-chip microcontroller with an on-chip one-time writable PROM or with an on-chip
EPROM which has program write, erasure and rewrite capability.
It is possible to make all the functions except for PROM specification, and mask option, to the same as those of
mask ROM products by setting the memory size switching register (IMS) and the internal expansion RAM size
switching register (IXS).
Differences between the
m
PD78P048A and mask ROM products (
m
PD78042F, 78043F, 78044F, and 78045F) are
shown in Table 1-1.
Table 1-1. Differences between
m
PD78P048A and Mask ROM Products
Item
m
PD78P048A
Mask ROM Products
Internal ROM structure
One-time PROM/EPROM
Mask ROM
Internal ROM capacity
60K bytes
m
PD78042F: 16K bytes
m
PD78043F: 24K bytes
m
PD78044F: 32K bytes
m
PD78045F: 40K bytes
Internal high-speed RAM capacity
1024K bytes
m
PD78042F: 512 bytes
m
PD78043F: 512 bytes
m
PD78044F: 1024 bytes
m
PD78045F: 1024 bytes
Changes of internal ROM and internal high-speed
RAM capacities by memory size switching register
(IMS)
Available
Notes 1
Not available
Change of internal expansion RAM capacity by
internal expansion RAM size switching register
(IXS)
Available
Notes 2
Not available
IC pin
No
Yes
V
PP
pin
Yes
No
Mask option with internal pull-down resistor for pins
P30-P37, P106, P107, P110-P117, and P120-P127.
No
Yes
Mask option with internal pull-up resistor for pins
P70-P74.
No
Yes
Electrical characteristics
Refer to the
Data Sheet
for each product.
Notes 1.
The internal PROM becomes to 60K bytes and the internal high-speed RAM becomes 1024 bytes by the
RESET input.
2.
The internal expansion RAM becomes to 1024 bytes by the RESET input.
Caution Noise resistance and noise radiation are different in PROM version and mask ROM versions. If using
a mask ROM version instead of the PROM version for processes between prototype development
and full production, be sure to fully evaluate the CS of the mask ROM version (not ES).
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