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| MC68HC912D60 Datasheet, PDF (373/432 Pages) Freescale Semiconductor, Inc – M68HC12 Microcontrollers | |||
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Freescale Semiconductor, Inc.
Electrical Specifications
Tables of Data
programming voltage via diode reverse-biases D2, protecting VDD from
excessive reverse current. D2 also protects the FLASH from damage
should programming voltage go to 0. Programming power supply
voltage must be adjusted to compensate for the forward-bias drop
across D1. The charge time constant of R1 and C1 filters transients,
while R2 provides a discharge bleed path to C1. Allow for RC charge and
discharge time constants when applying and removing power. When
using this circuit, keep leakage from external devices connected to the
VFP pin low, to minimize diode voltage drop.
PROGRAMMING VOLTAGE
POWER SUPPLY
D1
4.5V
VDD
D2
R2
22kâ¦
R1
10â¦
VFP
PIN
C1
0.1µF
Figure 20-1VFP Conditioning Circuit
13.5V
12.8V
11.4V
6.5V
4.5V
4.15V
30ns MAXIMUM
VFP ENVELOPE
VDD ENVELOPE
COMBINED VDD AND VFP
tER
68HC(9)12D60 â Rev 4.0
MOTOROLA
0V
â0.30V
POWER
ON
NORMAL
READ
PROGRAM
ERASE
VERIFY
POWER
DOWN
Figure 20-2VFP Operating Range
Electrical Specifications
For More Information On This Product,
Go to: www.freescale.com
Advance Information
373
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