參數(shù)資料
型號: SAA5647HL
廠商: NXP Semiconductors N.V.
英文描述: Enhanced TV microcontrollers with On-Screen Display (OSD)(帶全屏顯示的增強型TV控制器)
中文描述: 與微控制器在強化電視屏幕顯示(OSD)(帶全屏顯示的增強型電視控制器)
文件頁數(shù): 11/112頁
文件大小: 436K
代理商: SAA5647HL
2000 Jun 30
11
Philips Semiconductors
Objective specification
Enhanced TV microcontrollers with
On-Screen Display (OSD)
SAA56xx
8.2
ROM protection and verification
SAA56xx devices have a set of security bits allied with
each section of the device, i.e. Program ROM, Character
ROM and Packet 26 ROM. The security bits are used to
prevent the ROM from being overwritten once
programmed, and also the contents being verified once
programmed.
The security bits can be programmed once only and
cannot
be erased.
The SAA56xx security bits are set as shown in Fig.4 for
production programmed devices and are set as shown in
Fig.5 for production blank devices.
handbook, full pagewidth
GSA036
PROGRAM ROM
(128 or 192 kbytes)
MEMORY
USER ROM PROGRAMMING
VERIFY
DISABLED
ENABLED
DISABLED
ENABLED
DISABLED
ENABLED
SECURITY BITS SET
CHARACTER ROM
(12 kbytes)
PACKET 26 ROM
(4 kbytes)
Fig.4 Security bits for production programmed devices.
handbook, full pagewidth
GSA037
PROGRAM ROM
(128 OR 192 kbytes)
MEMORY
USER ROM PROGRAMMING
VERIFY
ENABLED
ENABLED
ENABLED
ENABLED
ENABLED
ENABLED
SECURITY BITS SET
CHARACTER ROM
(12 kbytes)
PACKET 26 ROM
(4 kbytes)
Fig.5 Security bits for production blank devices.
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