W7100A WIZnet, W7100A Datasheet - Page 27

• Manufacturer Part Number: W7100A
• Description: 8-bit Microcontrollers - MCU 8051 CORE+HARDWIRED TCP/IP+MAC+PHY
• Manufacturer: WIZnet

Specifications of W7100A

• Rohs: yes
• Core: 8051
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 25 MHz
• Program Memory Size: 255 B
• Data Ram Size: 64 KB
• On-chip Adc: No
• Operating Supply Voltage: 3 V to 3.6 V
• Operating Temperature Range: - 40 C to + 80 C
• Package / Case: LQFP-100
• Mounting Style: SMD/SMT
• Interface Type: UART
• Program Memory Type: Flash

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2.3. But since the addresses of ‘Boot ROM / APP Entry’ and FLASH are overlapped, they use
same address at 0x0000 ~ 0x07FF / 0xFFF7 ~ 0xFFFF. The iMCU W7100A respectively maps the
‘Boot ROM / APP Entry’ and FLASH(64K) to the code and data memory.
state, the FLASH cannot be used as a code memory because this state is for writing user
application code. To use the FLASH as a code memory, the memory map needs to be switched.
To do this, user should select APP Mode by setting the BOOTEN pin to ‘0’, and then the Boot
ROM code jumps to APP Entry immediately. Next, the APP Entry un-maps the Boot ROM and
maps the Code FLASH to code memory. After switching the code memory map, the APP Entry
The initial state of W7100A has both ‘Boot ROM / APP Entry’ and FLASH as shown in Figure
The user application code can be written to the FLASH(mapped to data memory). But in this
Figure 2.2. Boot Sequence Flowchart
Figure 2.3 APP Entry Process
Ver. 1.12
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