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參數(shù)資料
| 型號： | P83C180 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | Microcontrollers for monitors with DDC interface, auto-sync detection and sync proc(帶DDC接口，同步監(jiān)測和同步處理的監(jiān)視器微控制器) |
| 中文描述： | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, PDIP42 |
| 封裝： | 0.600 INCH, PLASTIC, SOT-270-1, SDIP-42 |
| 文件頁數(shù)： | 9/84頁 |
| 文件大?。?/td> | 420K |
| 代理商： | P83C180 |
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1997 Dec 12
9
Philips Semiconductors
Product specification
Microcontrollers for monitors with DDC
interface, auto-sync detection and sync proc.
P83Cx80; P87C380
7
MEMORY ORGANIZATION
The Central Processing Unit (CPU) manipulates operands in two memory spaces. There are 512 bytes of internal data
memory, consisting of 256 bytes standard RAM and 256 bytes RAM buffer which is accessible as the Auxiliary RAM
(AUX-RAM) or addressed through DDCADR and RAMBUF. The memory map and address spaces are shown in Fig.3.
7.1
Program memory
The program memory consists of ROM: 8 kbytes (P83C880), 16 kbytes (P83C180), 24 kbytes (P83C280) and 32 kbytes
(P83C380). The program memory implemented in the P87C380 is a 16 kbytes EPROM (OTP).
7.2
Internal data memory
The internal data memory is divided into three physically separated parts: 256 bytes of RAM, 256 bytes of AUX-RAM,
and a 128 bytes Special Function Registers (SFRs) area. These can be addressed each in a different way as described
in Sections 7.2.1 to 7.2.3 and Table 3.
Table 3
Internal data memory map
Notes
1.
2.
RAM locations 0 to 127 can be addressed directly and indirectly as in the 80C51.
RAM locations 128 to 255 can only be addressed indirectly.
MEMORY
LOCATION
ADDRESS MODE
POINTERS
DIRECT
INDIRECT
RAM
0 to 127
(1)
128 to 255
(2)
X
X
X
X
address pointers are R0 and R1 of the selected register bank
AUX-RAM 0 to 255
SFRs
X
(3)
address pointer DDCADR and RAMBUF
128 to 255
andbook, full pagewidth
MGG028
overlapped space
255
127
0
INTERNAL
program memory area
internal data memory area
32767
(1)
24575
(2)
16383
(3)
8191
(4)
0
INDIRECT
ONLY
INDIRECT
ONLY
DIRECT AND
INDIRECT
SPECIAL
FUNCTION
REGISTERS
AUX-RAM
BUFFER
255
0
Fig.3 Memory map and address spaces.
(1) P83C380 and P87C380.
(2) P83C280.
(3) P380C180.
(4) P83C880.
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