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參數(shù)資料
| 型號(hào)： | SAA5667HL/NNNN |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 12 MHz, MICROCONTROLLER, PQFP100 |
| 封裝： | 14 X 14 MM, 1.40 MM HEIGHT, PLASTIC, MS-026, SOT-407-1, LQFP-100 |
| 文件頁(yè)數(shù)： | 13/112頁(yè) |
| 文件大小： | 537K |
| 代理商： | SAA5667HL/NNNN |
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2004 Sep 03
11
Philips Semiconductors
Product specication
Enhanced TV microcontrollers with
On-Screen Display (OSD)
SAA56xx
8.2
ROM protection and verication
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
SECURITY BITS SET
CHARACTER ROM
(12 kbytes)
PACKET 26 ROM
(4 kbytes)
Fig.5 Security bits for production blank devices.
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