XC912BC32CFU8 Motorola Semiconductor Products, XC912BC32CFU8 Datasheet - Page 95

• Manufacturer Part Number: XC912BC32CFU8
• Description: M68HC12B Family Data Sheet
• Manufacturer: Motorola Semiconductor Products

6.3.9 Reduced Drive of I/O Lines
M68HC12B Family — Rev. 8.0
MOTOROLA
Read: Anytime, if register is in the map
Write: Once in normal modes; anytime, except the first time, in special modes
These bits select reduced drive for the associated port pins. This gives reduced
power consumption and reduced radio frequency interference (RFI) with a slight
increase in transition time (depending on loading). The reduced drive function is
independent of which function is being used on a particular port. This register is not
in the map in peripheral mode.
RDPE — Reduced Drive of Port E Bit
RDPB — Reduced Drive of Port B Bit
RDPA — Reduced Drive of Port A Bit
Address: $000D
Reset:
Read:
Write:
1 = Reduced drive for all port E output pins
0 = Full drive for all port E output pins
1 = Reduced drive for all port B output pins
0 = Full drive for all port B output pins
1 = Reduced drive for all port A output pins
0 = Full drive for all port A output pins
Bit 7
0
0
Bus Control and Input/Output (I/O)
Figure 6-9. Reduced Drive of I/O Lines (RDRIV)
= Unimplemented
6
0
0
5
0
0
4
0
0
RDPE
3
0
Bus Control and Input/Output (I/O)
2
0
0
RDPB
1
0
Data Sheet
Registers
RDPA
Bit 0
0
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