P83C180 데이터 시트보기 (PDF) - Unspecified

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P83C180

Microcontrollers for monitors with DDC interface, auto-sync detection and sync proc.

Unspecified 

Philips Semiconductors

Microcontrollers for monitors with DDC

interface, auto-sync detection and sync proc.

Product specification

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.

andbook, full pagewidth

32767(1)

24575(2)

16383(3)

8191(4)

INTERNAL

0

program memory area

overlapped space

255

INDIRECT

ONLY

127

DIRECT AND

INDIRECT

0

255

SPECIAL

FUNCTION

REGISTERS

0

internal data memory area

AUX-RAM

BUFFER

INDIRECT

ONLY

MGG028

(1) P83C380 and P87C380.

(2) P83C280.

(3) P380C180.

(4) P83C880.

Fig.3 Memory map and address spaces.

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

MEMORY LOCATION

RAM

0 to 127(1)

128 to 255(2)

AUX-RAM 0 to 255

SFRs

128 to 255

ADDRESS MODE

DIRECT INDIRECT

POINTERS

X

X

address pointers are R0 and R1 of the selected register bank

−

X

−

X(3) address pointer DDCADR and RAMBUF

X

−

−

Notes

1. RAM locations 0 to 127 can be addressed directly and indirectly as in the 80C51.

2. RAM locations 128 to 255 can only be addressed indirectly.

1997 Dec 12

9

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