参数资料
型号: COP8CCR9LVA8
厂商: National Semiconductor
文件页数: 29/111页
文件大小: 0K
描述: IC MCU EEPROM 8BIT 68-PLCC
标准包装: 18
系列: COP8™ 8C
核心处理器: COP8
芯体尺寸: 8-位
速度: 20MHz
连通性: Microwire/Plus(SPI),UART/USART
外围设备: 欠压检测/复位,POR,PWM,WDT
输入/输出数: 59
程序存储器容量: 32KB(32K x 8)
程序存储器类型: 闪存
RAM 容量: 1K x 8
电压 - 电源 (Vcc/Vdd): 2.7 V ~ 5.5 V
数据转换器: A/D 16x10b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 68-LCC(J 形引线)
包装: 管件
其它名称: *COP8CCR9LVA8
SNOS535I – OCTOBER 2000 – REVISED MARCH 2013
Figure 5-1. RAM Organization
5.4.1
Virtual EEPROM
The Flash memory and the User ISP functions (see Section 5.7), provide the user with the capability to
use the flash program memory to back up user defined sections of RAM. This effectively provides the user
with the same nonvolatile data storage as EEPROM. Management, and even the amount of memory
used, are the responsibility of the user, however the flash memory read and write functions have been
provided in the boot ROM.
One typical method of using the Virtual EEPROM feature would be for the user to copy the data to RAM
during system initialization, periodically, and if necessary, erase the page of Flash and copy the contents
of the RAM back to the Flash.
5.5
OPTION REGISTER
The Option register, located at address 0x7FFF in the Flash Program Memory, is used to configure the
user selectable security, WATCHDOG, and HALT options. The register can be programmed only in
external Flash Memory programming or ISP Programming modes. Therefore, the register must be
programmed at the same time as the program memory. The contents of the Option register shipped from
the factory read 00 Hex.
The format of the Option register is as follows:
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
WATCH
Reserved
SECURITY
Reserved
HALT
FLEX
DOG
Bits 7, 6
These bits are reserved and must be 0.
Bit 5
= 1
Security enabled. Flash Memory read and write are not allowed except in User ISP/Virtual E2
commands. Mass Erase is allowed.
= 0
Security disabled. Flash Memory read and write are allowed.
Bits 4, 3
These bits are reserved and must be 0.
24
Functional Description
Copyright 2000–2013, Texas Instruments Incorporated
Product Folder Links: COP8CBR9 COP8CCR9 COP8CDR9
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