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User Guide V1.10

Device FLASH Code E

PROM SRAM I/O Vcc Vpp Prog Mode

Size (Bytes) (Bytes) (Note 2) (Note 1) Supported

T89C51RD2-M 64K 2K 1280 32-48 4.5-5.5V No (Internal) ISP

T89C51RD2-L 64K 2K 1280 32-48 2.7-5.5V* No (Internal) ISP

Device Support - TEMIC Microcontrollers

TEMIC Semiconductors FLASH 8051 Microcontroller Families

KEY: ISP = In-System Programming Mode

Note 1 - Vpp issues

• T89C51RD2 devices generate Vpp internally from the standard Vcc. Simply connect EA to

Vcc to enter ISP mode. Applying a voltage higher than Vcc to the EA pin may damage the

device.

Note 2 - Vcc issues

• The Gemini programmer does not support operation below 4.8V

Temic T89C51RD2 microcontroller features

• The last 1K of T89C51RD2 Flash is used for ISP/IAP firmware and cannot be changed by

ISP. A parallel programmer is needed to change this area.

• Hardware lock bits cannot be changed by ISP.

The TEMIC devices feature ‘Software’ and ‘Hardware’ lock bits. The ‘Hardware’ lock bits

can only be programmed using a ‘parallel’ programmer. The ‘software’ lock bits can be

programmed using the Gemini ISP programmer. The FLASH code area can not be

modified anymore once the ‘software’ lock bits are set without first performing a ‘Chip

Erase’ operation using a parallel programmer.

NOTE:

Once you have locked the device in ISP mode, you can not unlock it except by physically

removing it from your target system and erasing it in a parallel programmer.

• The FLASH code can be reprogrammed in pages or one byte at a time without needing

a block erase. The programmed bytes are automatically erased before programming.

• The Temic devices allow the ‘6 Clock or 12 Clock’ to be dynamically changed by

software in the user application. The T89C51RD2 is always configured in 12 Clock mode

after RESET and during ISP.

Figure 3

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Equinox Systems GEMINI Guide de l'utilisateur Page 11