Datasheet

4266C–CAN–03/08

AT89C51CC03 UART Bootloader

Erase Flash The AT89C51CC03 flash memory is divided in several blocks:

Block 0: from address 0000h to 1FFFh

Block 1: from address 2000h to 3FFFh

Block 2: from address 4000h to 7FFFh

These three blocks contain 128 pages.

• Parameter settings

• instruction: LCALL FFF0h.

Note: 1. See the AT89C51CC03 datasheet for the time that a write operation takes and this time must

multiply by the number of pages.

2. No special resources are used by the bootloader during these operations

Start Bootloader This routine allows to start at the beginning of the bootloader as after a reset. After calling this

routine the regular boot process is performed and the communication must be opened before

any action.

• No special parameter setting

• Set bit ENBOOT in AUXR1 register

• instruction: LJUMP or LCALL at address F800h

API name R1 DPTR0 DPTR1 Acc

__api_erase_block0

01h

0000h x x

__api_erase_block1 2000h x x

__api_erase_block2 4000h x x

__api_erase_block3 8000h x x

__api_erase_block4 C000h x x