at89c5131 ATMEL Corporation, at89c5131 Datasheet - Page 28

• Manufacturer Part Number: at89c5131
• Description: 8-bit Flash Microcontroller With Full Speed Usb Device At89c5131
• Manufacturer: ATMEL Corporation

Flash Memory
Architecture
Figure 14. Flash Memory Architecture
FM0 Memory Architecture
User Space
Extra Row (XRow)
Hardware Security Space
Column Latches
28
Column Latches (128 Bytes)
3FFFh for
AT89C5130A
for 16 KB
7FFFh for
AT89C5131A
for 32 KB
Hardware Security (1 Byte)
AT89C5131
Extra Row (128 Bytes)
AT89C5131 features two on-chip Flash memories:
•
•
The FM0 supports both parallel programming and Serial In-System Programming (ISP)
whereas FM1 supports only parallel programming by programmers. The ISP mode is
detailed in the “In-System Programming” section.
All Read/Write access operations on Flash memory by user application are managed by
a set of API described in the “In-System Programming” section.
The Flash memory is made up of 4 blocks (see Figure 14):
1. The memory array (user space) 16/32 Kbytes
2. The Extra Row
3. The Hardware security bits
4. The column latch registers
This space is composed of a 16/32 Kbytes Flash memory organized in 128/256 pages
of 128 bytes. It contains the user’s application code.
This row is a part of FM0 and has a size of 128 bytes. The extra row may contain infor-
mation for bootloader usage.
The hardware security space is a part of FM0 and has a size of 1 byte.
The 4 MSB can be read/written by software. The 4 LSB can only be read by software
and written by hardware in parallel mode.
The column latches, also part of FM0, have a size of full page (128 bytes).
The column latches are the entrance buffers of the three previous memory locations
(user array, XRow and Hardware security byte).
0000h
Flash memory FM0:
containing 16/32 Kbytes of program memory (user space) organized into 128-byte
pages,
Flash memory FM1:
3 Kbytes for bootloader and Application Programming Interfaces (API).
Flash Memory
User Space
16:32 KB
FM0
FM1 mapped between FFFFh and
F400h when bit ENBOOT is set in
AUXR1 register
Flash Memory
Boot Space
3 Kbytes
FM1
FFFFh
F400h
4136C–USB–04/05