P83C180AER/001 데이터 시트보기 (PDF) - Philips Electronics

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P83C180AER/001

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

Philips Electronics 

Philips Semiconductors

Microcontrollers for monitors with DDC

interface, auto-sync detection and sync proc.

Product specification

P83Cx80; P87C380

3. Indirect-addressable via MOVX-Datapointer or

MOVX-Ri instructions.

7.2.1 RAM

Four register banks, each 8 registers wide, occupy

locations 0 through 31 in the lower RAM area. Only one of

these banks may be enabled at a time. The next 16 bytes,

locations 32 through 47, contain 128 directly addressable

bit locations. The stack can be located anywhere in the

internal 256 bytes RAM. The stack depth is only limited by

the available internal RAM space of 256 bytes (see Fig.4).

7.2.2 SPECIAL FUNCTION REGISTERS (SFRS)

The SFRs can only be addressed directly in the address

range from 128 to 255 (see Fig.3). Figure 5 gives an

overview of the Special Function Registers space. Sixteen

address in the SFRs space are both byte and

bit-addressable. The bit-addressable SFRs are those

whose address ends in 0H and FH. The bit addresses in

this area are 80H to FFH

7.2.3 AUX-RAM

AUX-RAM buffer 0 to 255 is indirectly addressable as

external data memory locations 0 to 255 via

MOVX-Datapointer instruction or via MOVX-Ri instruction.

Since the external access function is not available, any

access to AUX-RAM 0 to 255 will not affect the ports.

The 256 bytes of AUX-RAM buffer used to support DDC

interface is also available for system usage by indirect

addressing through the address pointer DDCADR and

data I/O buffer RAMBUF. The address pointer (DDCADR)

is equipped with the post increment capability to facilitate

the transfer of data in bulk (for details refer to Chapter 17).

However, it is also possible to address the AUX-RAM

buffer through MOVX command as usually used in the

internal RAM extension of 80C51 derivatives.

BYTE

ADDRESS

(HEX)

BIT ADDRESS

(HEX)

BYTE

ADDRESS

(DECIMAL)

FFH (MSB)

(LSB) 255

2FH 7F 7E 7D 7C 7B 7A 79 78 47

2EH 77 76 75 74 73 72 71 70 46

2DH 6F 6E 6D 6C 6B 6A 69 68 45

2CH 67 66 65 64 63 62 61 60 44

2BH 5F 5E 5D 5C 5B 5A 59 58 43

2AH 57 56 55 54 53 52 51 50 42

29H 4F 4E 4D 4C 4B 4A 49 48 41

28H 47 46 45 44 43 42 41 40 40

27H 3F 3E 3D 3C 3B 3A 39 38 39

26H 37 36 35 34 33 32 31 30 38

25H 2F 2E 2D 2C 2B 2A 29 28 37

24H 27 26 25 24 23 22 21 20 36

23H 1F 1E 1D 1C 1B 1A 19 18 35

22H 17 16 15 14 13 12 11 10 34

21H 0F 0E 0D 0C 0B 0A 09 08 33

20H 07 06 05 04 03 02 01 00 32

1FH

31

BANK 3

18H

24

17H

23

BANK 2

10H

16

0FH

15

BANK 1

08H

8

07H

7

BANK 0

00H

0

MBH079

Fig.4 RAM bit addresses.

1997 Dec 12

10

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