Datasheet

Chapter 2 Port Integration Module (S12XEPIMV1)
MC9S12XE-Family Reference Manual Rev. 1.25
Freescale Semiconductor 165
2.3.87 Port R Data Direction Register (DDRR)
NOTE
Due to internal synchronization circuits, it can take up to 2 bus clock cycles
until the correct value is read on PTR or PTIR registers, when changing the
DDRR register.
2.3.88 Port R Reduced Drive Register (RDRR)
Address 0x036A Access: User read/write
(1)
1. Read: Anytime.
Write: Anytime.
76543210
R
DDRR7 DDRR6 DDRR5 DDRR4 DDRR3 DDRR2 DDRR1 DDRR0
W
Reset 00000000
Figure 2-85. Port R Data Direction Register (DDRR)
Table 2-83. DDRR Register Field Descriptions
Field Description
7-0
DDRR
Port R data direction—
This register controls the data direction of pins 7 through 0.
The TIM forces the I/O state to be an output for each timer port associated with an enabled output compare. In this
case the data direction bits will not change.
The data direction bits revert to controlling the I/O direction of a pin when the associated timer output compare is
disabled.
The timer Input Capture always monitors the state of the pin.
1 Associated pin is configured as output.
0 Associated pin is configured as high-impedance input.
Address 0x036B Access: User read/write
(1)
1. Read: Anytime.
Write: Anytime.
76543210
R
RDRR7 RDRR6 RDRR5 RDRR4 RDRR3 RDRR2 RDRR1 RDRR0
W
Reset 00000000
Figure 2-86. Port R Reduced Drive Register (RDRR)