SAA5X9X Datasheet, PDF(14/68 Page) NXP Semiconductors – Economy teletext and TV microcontrollers

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SAA5X9X Datasheet, PDF (14/68 Pages) NXP Semiconductors – Economy teletext and TV microcontrollers

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7.4 Microcontroller interfacing

The 80C51 communicates with the peripheral functions using Special Function Registers (SFRs) which are addressed as RAM locations. The registers

in the teletext decoder appear as normal SFRs in the microcontroller memory map, but are written to using an internal serial bus. The SFR map is given

in Table 10.

7.4.1 SPECIAL FUNCTION REGISTER MAP

Table 10 Special Function Register map; note 1

DIRECT

SYMBOL NAME

ADDR.

(HEX)

ACC(2) Accumulator

B(2)

B register

DPTR

Data Pointer

(2 bytes)

DPH

High byte

DPL

Low byte

IE(2)(3)

Interrupt

Enable

P0(2)

Port 0

P1(2)

Port 1

P2(2)

Port 2

P3(2)(3)

Port 3

PCON(3) Power Control

BIT ADDRESS, SYMBOL OR ALTERNATIVE PORT FUNCTION

ES1

ES2

ET1

EX1

ET0

ARD

GF1

GF0

RESET

VALUE

(HEX)

EX0

▷