MC68HC05F8 Datasheet, PDF (110/126 Pages) Motorola, Inc – High-density complementary metal oxide semiconductor(HCMOS) microcontroller unit

Freescale Semiconductor, Inc.
START
Vpp on
LAT = 1
Write EPROM byte
EPMG = 1
Wait 2ms
EPMG = 8
Wait 1ms
Write additional
Y
byte?
N
Vpp off
END
Figure 12-4 EPROM Programming Sequence
12
12.3.3 Program and Verify EPROM
In the Program and Verify EPROM routine, the contents of the external EPROM are copied into
the EPROM areas of the MC68HC705F8 device. There is a direct correspondence of addresses
between the two devices. Non-EPROM addresses are ignored so data contained in those areas
are not accessed. Unprogrammed EPROM address locations should contain $FF to speed up the
programming operation. During the programming routine the Program/Verify LED is illuminated.
At the end of the programming routine, the LED is turned off, and the verification routine is entered.
If the contents of the EPROM and external EPROM exactly match, then the Verified LED is
illuminated. The verification routine stops if a discrepancy has been detected.
MOTOROLA
12-6
OPERATING MODES
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MC68HC05F8