mc9s12hz256v2 Freescale Semiconductor, Inc, mc9s12hz256v2 Datasheet - Page 135

• Manufacturer Part Number: mc9s12hz256v2
• Description: Hcs12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

4.3.3.3
Read: Anytime. Write: Anytime.
This register configures port pins PM[5:2] as either input or output.
When a CAN module is enabled, the corresponding transmitter (TXCANx) pin becomes an output, the
corresponding receiver (RXCANx) pin becomes an input, and the associated Data Direction Register bits
have no effect. If a CAN module is disabled, the corresponding Data Direction Register bit reverts to
control the I/O direction of the associated pin.
4.3.3.4
Read: Anytime. Write: Anytime.
This register configures the drive strength of configured output pins as either full or reduced. If a pin is
configured as input, the corresponding Reduced Drive Register bit has no effect.
Freescale Semiconductor
DDRM[5:2]
RDRM[5:2]
Reset
Reset
Field
Field
5:2
5:2
W
W
R
R
Data Direction Port M
0 Associated pin is configured as input.
1 Associated pin is configured as output.
Reduced Drive Port M
0 Full drive strength at output
1 Associated pin drives at about 1/3 of the full drive strength.
Port M Data Direction Register (DDRM)
Port M Reduced Drive Register (RDRM)
0
0
0
0
7
7
= Reserved or Unimplemented
= Reserved or Unimplemented
0
0
0
0
6
6
Figure 4-19. Port M Reduced Drive Register (RDRM)
Figure 4-18. Port M Data Direction Register (DDRM)
Table 4-13. DDRM Field Descriptions
Table 4-14. RDRM Field Descriptions
DDRM5
RDRM5
MC9S12HZ256 Data Sheet, Rev. 2.05
0
0
5
5
DDRM4
RDRM4
0
0
4
4
Description
Description
DDRM3
RDRM3
0
0
3
3
Chapter 4 Port Integration Module (PIM9HZ256V2)
DDRM2
RDRM2
0
0
2
2
0
0
0
0
1
1
0
0
0
0
0
0
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