Hardware Description
2-8
AT89EVK-01 User Guide
4325C–SCR–09/04
2.2
T89C5121
Firmware
Reconfiguration
The program stored in the T89C5121 (Flash version) sends TWI commands to config-
ure the AT83C24 registers at each reset or power on.
If the user wants to modify the AT83C24 configuration, it need to reprogram the
T89C5121 Flash mem ory by using FLIP/BatchISP software (free download on
www.atmel.com) as described below.
Figure 2-5. T89C5121 In System Programming Description
2.2.1
CEIBO MP-51RD2
Programmer
The CEIBO “MP-51RD2 Programmer” board is used to interface the RS-232 and the Rx
Tx pins of the T89C5121. This board makes the electrical interface between microcon-
troller signals (5V) and RS-232 signals (12V).
FLIP/BatchISP software
(ATMEL In System Programming software)
RS-232
CEIBO
MP-51RD2 board
EVK01 board
Rx, Tx signals (5V)
5V
Power Supply
Waveform
Generator
XTAL1
VCC
VSS
(14.74 MHz)
Summary of Contents for AT89EVK-01
Page 2: ...Introduction 1 4 AT89EVK 01 User Guide 4325C SCR 09 04...
Page 10: ...Hardware Description 2 12 AT89EVK 01 User Guide 4325C SCR 09 04...
Page 13: ...AT89EVK 01 User Guide 4 15 4325C SCR 09 04 Section 4 Schematics...
Page 15: ...AT89EVK 01 User Guide 4 17 4325C SCR 09 04 Figure 4 3 Circuit Drawing...
