Freescale Semiconductor Demonstration Board for Freescale MC9S12XHY256 Microcontroller DEMO9S12XHY256 DEMO9S12XHY256 Manual De Usuario
Los códigos de productos
DEMO9S12XHY256
Port Integration Module (S12XHYPIMV1)
MC9S12XHY-Family Reference Manual, Rev. 1.04
Freescale Semiconductor
149
2.3.95
Port V Slew Rate Register(SRRV)
1
Read: Anytime.
Write: Anytime.
Write: Anytime.
Table 2-77. PPSV Register Field Descriptions
Field
Description
7-0
PPSV
Port V 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 V pin, if enabled by the associated bit in register PERV and
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 V pin, if enabled by the associated bit in register PERV and
if the port is used as input.
0 A pull-up device is connected to the associated Port V pin, if enabled by the associated bit in register PERV and if
the port is used as input.
Address 0x029E
Access: User read/write
1
1
Read: Anytime.
Write: Anytime.
Write: Anytime.
7
6
5
4
3
2
1
0
R
SRRV7
SRRV6
SRRV5
SRRV4
SRRV3
SRRV2
SRRV1
SRRV0
W
Reset
0
0
0
0
0
0
0
0
Figure 2-92. Port V Polarity Select Register (SRRV)
Table 2-78. SRRV Register Field Descriptions
Field
Description
7-0
SRRV
Port V Slew Rate Register—Determine the slew rate on the pins
1
1 Enable the slew rate control and disables the digital input buffer
2
0 Disable the slew rate control and enable the digital input buffer
1
When change SRRV 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.
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.
2
When MC function is disabled and IIC/SPI/PWM async shutdown are routing to PV and enabled, the corresponding digital input
buffer will be always enabled
buffer will be always enabled