mc9s12xf512 Freescale Semiconductor, Inc, mc9s12xf512 Datasheet - Page 873

• Manufacturer Part Number: mc9s12xf512
• Description: S12x Microcontrollers 16-bit Automotive Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

1. Read: Anytime.
19.3.40 Port M Reduced Drive Register (RDRM)
Freescale Semiconductor
Address 0x0253
Write: Anytime.
DDRM
DDRM
DDRM
DDRM
Field
Reset
7-6
5-2
1
0
W
R
Port M data direction—
This register controls the data direction of pins 7 through 6.
The PMF forces the I/O state to be an to be an input on the associated FAULT[3:2] pins if fault protection functions
are enabled. Refer to PMF Block Guide. In this case the data direction bit will not change.
1 Associated pin is configured as output.
0 Associated pin is configured as input.
Port M data direction—
This register controls the data direction of pins 5 through 2.
1 Associated pin is configured as output.
0 Associated pin is configured as input.
Port M data direction—
This register controls the data direction of pin 1.
The CAN forces the I/O state to be an output (TXCAN) if enabled . In this case the data direction bit will not change.
1 Pin is configured as output.
0 Associated pin is configured as input.
Port M data direction—
This register controls the data direction of pin 0.
The CAN forces the I/O state to be an input (RXCAN) if enabled . In this case the data direction bit will not change.
1 Pin is configured as output.
0 Pin is configured as input.
RDRM7
0
7
Due to internal synchronization circuits, it can take up to 2 bus clock cycles
until the correct value is read on PTM or PTIM registers, when changing the
DDRM register.
RDRM6
0
6
Figure 19-38. Port M Reduced Drive Register (RDRM)
Table 19-35. DDRM Register Field Descriptions
MC9S12XF - Family Reference Manual, Rev.1.19
RDRM5
0
5
RDRM4
NOTE
0
4
Description
RDRM3
3
0
Chapter 19 Port Integration Module (S12XFPIMV2)
RDRM2
0
2
Access: User read/write
RDRM1
0
1
RDRM0
0
0
873
(1)