TDA936X データシートの表示（PDF） - Philips Electronics

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TDA936X

TV signal processor-Teletext decoder with embedded µ-Controller

Philips Electronics 

Philips Semiconductors

TV signal processor-Teletext decoder with

embedded µ-Controller

Preliminary specification

TDA 935X/6X/8X series

Microcontroller

The functionality of the microcontroller used on the device is described here with reference to the industry

standard 80C51 microcontroller. A full description of its functionality can be found in the "80C51 Based 8-Bit

Microcontrollers - Philips Semiconductors (ref. IC20)" (Reference [1])

Memory Organisation

The device has the capability of a maximum of 128K PROGRAM ROM and 12K DATA RAM internally.

ROM BANK SWITCHING

Devices with up to 64K Program ROM have a continuous address space. Devices with over 64K Program ROM

use ROM bank switching. The 128K version is arranged in four banks of 32K. One of the 32K banks is common

and is always addressable. The other three banks(Bank0,Bank1,Bank2) can be accessed by selecting the right

bank via the SFR ROMBK bits 1/0.

FFFFH

Bank0

32K

8000H

FFFFH

Bank1

32K

8000H

FFFFH

Bank2

32K

8000H

1999 Sep 28

7FFFH

Common

32K

0000H

Figure 5 ROM Bank Switching memory map

ROMBK<2:0>

00

01

10

11

Table 2

0 to 32K

32K to 64K

Common

Bank0

Common

Bank1

Common

Bank2

Reserved

Reserved

ROM Bank Selection

12

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