参数资料
型号: T89C51AC2-SLSIM
厂商: Atmel
文件页数: 52/121页
文件大小: 0K
描述: IC 8051 MCU FLASH 32K 44PLCC
标准包装: 27
系列: 89C
核心处理器: 8051
芯体尺寸: 8-位
速度: 40MHz
连通性: UART/USART
外围设备: POR,PWM,WDT
输入/输出数: 34
程序存储器容量: 32KB(32K x 8)
程序存储器类型: 闪存
EEPROM 大小: 2K x 8
RAM 容量: 1.25K x 8
电压 - 电源 (Vcc/Vdd): 3 V ~ 5.5 V
数据转换器: A/D 8x10b
振荡器型: 外部
工作温度: -40°C ~ 85°C
封装/外壳: 44-LCC(J 形引线)
包装: 管件
36
A/T89C51AC2
4127H–8051–02/08
FM0 Memory Architecture
The Flash memory is made up of 4 blocks (see Figure 20):
The memory array (user space) 32 KB
The Extra Row
The Hardware security bits
The column latch registers
User Space
This space is composed of a 32 KB Flash memory organized in 256 pages of 128 Bytes.
It contains the user’s application code.
Extra Row (XRow)
This row is a part of FM0 and has a size of 128 Bytes. The extra row may contain infor-
mation for boot loader usage.
Hardware Security Byte
The Hardware security Byte 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.
Column Latches
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).
Cross Flash Memory Access
Description
The FM0 memory can be program only from FM1. Programming FM0 from FM0 or from
external memory is impossible.
The FM1 memory can be program only by parallel programming.
The Table 23 show all software Flash access allowed.
Table 23. Cross Flash Memory Access
C
o
d
e
x
e
c
u
ti
n
g
fr
o
m
Action
FM0
(user Flash)
FM1
(boot Flash)
FM0
(user Flash)
Read
ok
-
Load column latch
ok
-
Write
-
FM1
(boot Flash)
Read
ok
Load column latch
ok
-
Write
ok
-
External
memory
EA = 0
Read
-
Load column latch
-
Write
-
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