AT89C5131A-RDTIM datasheet(46/186 Pages) ATMEL

46 / 186 page

AT89C5130A/31A-M

4337G–USB–11/06

Application-

Programming-Interface

Several Application Program Interface (API) calls are available for use by an application

program to permit selective erasing and programming of Flash pages. All calls are made

by functions.

All these APIs are described in detail in the following document on the Atmel web site.

–

Datasheet Bootloader USB AT89C5131.

XROW Bytes

The EXTRA ROW (XROW) includes 128 bytes. Some of these bytes are used for spe-

cific purpose in conjonction with the bootloader.

Table 43.

XROW Mapping

Hardware Conditions

It is possible to force the controller to execute the bootloader after a Reset with hard-

ware conditions. Depending on the product type (low pin count or high pin count

package), there are two methods to apply the hardware conditions.

High Pin Count Hardware

Conditions (PLCC52, QFP64)

For high pin count packages, the hardware conditons (EA = 1, PSEN = 0) are sampled

during the RESET rising edge to force the on-chip bootloader execution (See Figure 82

on page 172). In this way the bootloader can be carried out regardless of the user Flash

memory content.

As PSEN is an output port in normal operating mode (running user application or boot-

loader code) after reset, it is recommended to release PSEN after rising edge of reset

signal.

To ensure correct microcontroller startup, the PSEN pin should not be tied to ground

during power-on, see Figure 24.

Figure 24.

Hardware conditions typical sequence during power-on.

Description

Default Value

Address

Copy of the Manufacturer Code

58h

30h

Copy of the Device ID#1: Family code

D7h

31h

Copy of the Device ID#2: Memories size and type

BBh

60h

Copy of the Device ID#3: Name and Revision

FFh

61h

VCC

PSEN

RST

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