T89C5121-ICUIL Atmel, T89C5121-ICUIL Datasheet - Page 62

• Manufacturer Part Number: T89C5121-ICUIL
• Description: IC 8051 MCU W/SMART CARD 24SSOP
• Manufacturer: Atmel
• Series: 89Cr

Specifications of T89C5121-ICUIL

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: SmartCard, UART/USART
• Peripherals: LED, POR, WDT
• Number Of I /o: 14
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: Flash RAM
• Eeprom Size: 16K x 8
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 2.85 V ~ 5.4 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 24-SSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Data Converters: -
• Other names: Q1468934; T89C5121-ICSIL; T89C5121-ICSIL

T85C121 Code RAM Version
62
A/T8xC5121
If a serial communication device (as described above: TWI or RS232) is detected, the
program download its content in the internal EEPROM and in CRAM.
Else, the program is internally downloaded from the internal EEPROM into the program
CRAM memory (16 Kbytes)
Then, in the two cases, the Bootloader executes a Long Jump at address 0000h which
initializes the Program counter at the lower address (0000h) of the executable CRAM.
Figure 24. CRAM with ROM and EEPROM Memory Mappings
Two memory blocks are implemented:
•
•
After Reset, the program is downloaded, as described in last paragraph, from either an
external EEPROM or from an host connected on RS232 serial link into the program
CRAM memory of 16 Kbytes. Then the Program Counter is set at address 0000h of the
CRAM space and the program is executed.
FFFFh
F800h
C000h
The ROM memory contains the Bootloader program.
The CRAM is the Application program memory.
entry point
Bootloader
ROM
3FFFh
0000h
CRAM
16 Kbytes
256 bytes
XRAM
256 bytes
RAM
4164G–SCR–07/06