Philips Semiconductors
Standard TV microcontrollers with
On-Screen Display (OSD)
Preliminary specification
SAA55xx
handbook, full pagewidthMEMORY
PROGRAM ROM
USER ROM
(64K x 8-BIT)
CHARACTER ROM
USER ROM
(9K x 12-BIT)
PACKET 26 ROM
USER ROM
(4K x 8-BIT)
SECURITY BITS INTERACTION
USER ROM PROGRAMMING
VERIFY
(ENABLE/DISABLE)
(ENABLE/DISABLE)
USER ROM PROGRAMMING
VERIFY
(ENABLE/DISABLE)
(ENABLE/DISABLE)
USER ROM PROGRAMMING
VERIFY
(ENABLE/DISABLE)
(ENABLE/DISABLE)
GSA030
Fig.4 Memory and security bit structures.
handbook, full pagewidthMEMORY
PROGRAM ROM
CHARACTER ROM
PACKET 26 ROM
SECURITY BITS SET
USER ROM PROGRAMMING
VERIFY
(ENABLE/DISABLE)
(ENABLE/DISABLE)
DISABLED
ENABLED
DISABLED
ENABLED
DISABLED
ENABLED
MBK954
1999 Oct 27
Fig.5 Security bits for production devices.
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