MC9S12HY64 Datasheet, PDF (119/792 Pages) Freescale Semiconductor, Inc – S12 Microcontrollers

2.3.78 Port U Polarity Select Register (PPSU)
Port Integration Module (S12HYPIMV1)
Address 0x0295
R
W
Reset
7
PPSU7
0
1 _{Read: Anytime.}
Write: Anytime.
6
PPSU6
5
PPSU5
4
PPSU4
3
PPSU3
2
PPSU2
0
0
0
0
0
Figure 2-76. Port U Polarity Select Register (PPSU)
Access: User read/write¹
1
0
PPSU1
PPSU0
0
0
Table 2-66. PPSU Register Field Descriptions
Field
7-0
PPSU
Description
Port U pull device select—Determine pull device polarity on input pins
This register serves a dual purpose by selecting the polarity of the active interrupt edge as well as selecting a pull-up
or pull-down device if enabled.
1 A pull-down device is connected to the associated Port U pin, if enabled by the associated bit in register PERU and
if the port is used as input.
0 A pull-up device is connected to the associated Port U pin, if enabled by the associated bit in register PERU and
if the port is used as input.
2.3.79 Port U Slew Rate Register(SRRU)
Address 0x0296
R
W
Reset
7
SRRU7
0
1 _{Read: Anytime.}
Write: Anytime.
6
SRRU6
5
SRRU5
4
SRRU4
3
SRRU3
2
SRRU2
0
0
0
0
0
Figure 2-77. Port U Polarity Select Register (SRRU)
Access: User read/write¹
1
0
SRRU1
SRRU0
0
0
Table 2-67. SRRU Register Field Descriptions
Field
Description
7-0
SRRU
Port U Slew Rate Register—Determine the slew rate on the pins¹
1 Enable the slew rate control and disables the digital input buffer
0 Disable the slew rate control and enable the digital input buffer
1 _{When change SRRU from non-zero value to zero value or vice versa, It will need to wait about 300 nanoseconds delay before}
the slew rate control to be real function as setting. When enter STOP, to save the power, the slew rate control will be force to off
state. After wakeup from STOP, it will also need to wait about 300 nanoseconds before slew rate control to be function as setting.
MC9S12HY/HA-Family Reference Manual, Rev. 1.04
Freescale Semiconductor
119