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User Guide V1.10

Target Fosc setting

The Target Fosc setting is not necessary for the TEMIC T89C51Rx2 devices. Although it can

be set, the microcontroller firmware disregards the value.

For Philips devices the programmer communicates with the target microcontroller using the

on-chip 8051 UART. The user must tell the programmer what oscillator frequency the target

system is running at. The Gemini software sends this value down to the target

microcontroller where the ‘Boot Loader’ code uses the oscillator frequency value to auto-

detect the baud rate from the PC.

Please note:

The Gemini software allows you to enter any value in the Fosc box. However, this value will

be automatically rounded down to the nearest integer MHz value when a programming

operation is initiated.

Target Settings

Target

Oscillator

Frequency

RESET

Polarity

Prog-Active Polarity

Timing

Parameters

Overview

The Gemini programmer programs a target

microcontroller using the In System

Programming (ISP) mode. This involves the

programmer forcing the target

microcontroller to execute the ‘ISP Boot

Loader’ firmware which is embedded in the

target device at the factory.

The user must specify the following

information about the target system:

i What frequency the target device is

running at (Fosc)?

ii What RESET polarity the target system

requires?

iii What timings are used to enter and exit

ISP mode?

Figure 18

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Equinox Systems GEMINI Guide de l'utilisateur Page 31