Port A Input/Output (I/O) Pins (Pta7/Kbd7–Pta0/Kbd0) - Motorola MC68HC908GP32 Technical Data Manual

1.6.5 CGM Power Supply Pins (V
1.6.6 External Filter Capacitor Pin (CGMXFC)
1.6.7 ADC Power Supply/Reference Pins (V
1.6.8 Port A Input/Output (I/O) Pins (PTA7/KBD7—PTA0/KBD0)
1.6.9 Port B I/O Pins (PTB7/AD7—PTB0/AD0)
MC68HC908GP32 MC68HC08GP32
•
MOTOROLA
Freescale Semiconductor, Inc.
and V
DDA
V and V are the power supply pins for the analog portion of the
DDA SSA
clock generator module (CGM). Connect the V
voltage potential as V
as V . Decoupling of these pins should be as per the digital supply.
SS
Section 7. Clock Generator Module
CGMXFC is an external filter capacitor connection for the CGM.
Section 7. Clock Generator Module
V and V are the power supply pins for the analog-to-digital
DDAD SSAD
converter (ADC). Connect the V
as V , and the V
DD SSAD
Decoupling of these pins should be as per the digital supply.
Section 5. Analog-to-Digital Converter
V is the high reference supply for the ADC, and is internally
REFH
connected to V .
DDAD
V is the low reference supply for the ADC, and is internally
REFL
connected to V .
SSAD
PTA7–PTA0 are general-purpose, bidirectional I/O port pins. Any or all
of the port A pins can be programmed to serve as keyboard interrupt
pins. See Section 16. Input/Output (I/O) Ports
Keyboard Interrupt Module
These port pins also have selectable pullups when configured for input
mode. The pullups are disengaged when configured for output mode.
The pullups are selectable on an individual port bit basis.
PTB7–PTB0 are general-purpose, bidirectional I/O port pins that can
also be used for analog-to-digital converter (ADC) inputs.
16. Input/Output (I/O) Ports
Converter (ADC).
Rev. 6
—
General Description
For More Information On This Product,
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)
SSA
, and the V pin to the same voltage potential
DD SSA
(CGMC).
(CGMC).
/V and V
DDAD REFH SSAD
pin to the same voltage potential
DDAD
pin to the same voltage potential as V
(ADC).
(KBI).
and Section 5. Analog-to-Digital
General Description
Pin Functions
pin to the same
DDA
See
See
/V )
REFL
.
SS
See
and Section 13.
See Section
Technical Data
41