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MN102HF75K Flash EEPROM Version
Using the Onboard Serial Programming Mode
MN102H75K/F75K/85K/F85K LSI User Manual
B.4.6 Setting Up the Onboard Serial Programming Mode
To enter serial programming mode, the microcontroller must be in write mode.
This section describes the pin setup for the serial writer interface.
Normal timing waveform
V
DD
V
PP
RST
SBT
SBD
Timing waveform during
serial programming
V
DD
V
PP
RST
SBT
SBD
Figure B-8 Timing for the Serial Writer Interface
To set up the serial writer interface:
1.
Turn on the external V
2.
At time A in figure B-8, turn V
3.
Through the serial writer, drive the RST pin from time B in figure B-8, when
SBT goes high on microcontroller power-up, for t
ler initializes.
4.
Through the serial writer, drive the SBD pin low from time C in figure B-8,
when RST goes high on microcontroller power-up, for t
the microcontroller that it is connected to the serial writer.
5.
Make t
long enough to allow the microcontroller oscillator to stabilize.
3
A
B
t
t
1
2
supply.
DD
on. At this point, output RST = SBD = low.
PP
Panasonic Semiconductor Development Company
325
Panasonic
C
D
t
3
cycles. The microcontrol-
2
cycles. This tells
3
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