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
141
2.3.87
Port U Slew Rate Register(SRRU)
2.3.88
Port U Routing Register (PTURR)
Address 0x0296
Access: User read/write
1
1
Read: Anytime.
Write: Anytime.
Write: Anytime.
7
6
5
4
3
2
1
0
R
SRRU7
SRRU6
SRRU5
SRRU4
SRRU3
SRRU2
SRRU1
SRRU0
W
Reset
0
0
0
0
0
0
0
0
Figure 2-84. Port U Polarity Select Register (SRRU)
Table 2-71. SRRU Register Field Descriptions
Field
Description
7-0
SRRU
Port U Slew Rate Register—Determine the slew rate on the pins
1
1 Enable the slew rate control and disables the digital input buffer
0 Disable the slew rate control and enable 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.
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.
Address 0x0297
Access: User read
1
1
Read: Always reads 0x00
Write: Unimplemented
Write: Unimplemented
7
6
5
4
3
2
1
0
R
0
0
0
0
PTURR0
PTURR0
0
0
W
Reset
0
0
0
0
0
0
0
0
= Unimplemented or Reserved
u = Unaffected by reset
Figure 2-85. Port U Routing Register (PTURR)