参数资料
型号: AT89EB5114-TGSIL
厂商: ATMEL CORP
元件分类: 微控制器/微处理器
英文描述: Low-pin-count 8-bit microcontroller with A/D converter
中文描述: 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PDSO20
封装: SO-20
文件页数: 72/95页
文件大小: 1126K
代理商: AT89EB5114-TGSIL
72
4311A–8051–01/05
Flash Memory
As shown Figure 32, the Flash version of AT8xEB5114 implements 4 Kbytes of on-chip
program/code memory.
The Flash memory increases EPROM and ROM functionality by in-circuit electrical era-
sure and programming. Thanks to the internal charge pump, the high voltage needed for
programming or erasing Flash cells is generated on-chip using the standard VDD
voltage.
Hardware programming mode is available using specific programming tool.
AT8xEB5114 features a Flash memory containing 4 Kbytes of program memory (user
space) organized into 128 byte pages,
This Flash memory is programmable by parallel programming.
Figure 32.
Flash Memory Architecture
FM0 Memory
Architecture
The Flash memory is made up of 4 blocks (see Figure 32):
The memory array (user space) 4 Kbytes
The Extra Row
The Hardware security bits
The column latch registers
User Space
This space is composed of a 4 Kbytes Flash memory organized in 32 pages of 128
bytes. It contains the user’s application code.
Extra Row (XRow)
This row is a part of flash memory and has a size of 128 bytes. The extra row may con-
tain information for boot loader usage.
Hardware security Byte
The Hardware Security Byte space is a part of flash memory 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.
Column latches
The column latches, also part of flash memory, 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).
Overview of Flash Memory
Operations
The CPU interfaces to the Flash memory through the FCON register used to:
Map the memory spaces in the adressable space
0FFFh
4 Kbytes
Flash memory
user space
0000h
Hardware Security (1 byte)
Extra Row (128 bytes)
Column Latches (128 bytes)
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