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| MC68HC912DG128 Datasheet, PDF (393/452 Pages) Motorola, Inc – Microcontrollers | |||
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Freescale Semiconductor, Inc.
Electrical Specifications
Tables of Data
Use of an external circuit to condition VFP is recommended. Figure 19-1
shows a simple circuit that maintains required voltages and filters
transients. VFP is pulled to VDD via Schottky diode D2. Application of
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 19-1. VFP Conditioning Circuit
MC68HC912DG128 â Rev 3.0
MOTOROLA
Electrical Specifications
For More Information On This Product,
Go to: www.freescale.com
Technical Data
393
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