Datasheet
Port Integration Module (S12XSPIMV1)
S12XS Family Reference Manual, Rev. 1.13
78 Freescale Semiconductor
2.3.9 Port E Data Direction Register (DDRE)
Table 2-8. PORTE Register Field Descriptions
Field Description
7
PE
Port E general purpose input/output data—Data Register, ECLKX2 output,
XCLKS input
When not used with the alternative function, the associated pin can be used as general purpose I/O. In general
purpose output mode the register bit value is driven to the pin.
If the associated data direction bit is set to 1, a read returns the value of the port register bit, otherwise the buffered
pin input state is read.
• The ECLKX2 output function takes precedence over the general purpose I/O function if enabled.
• The external clock selection feature (
XCLKS) is only active during RESET=0
6-5, 3-2
PE
Port E general purpose input/output data—Data Register
The associated pin can be used as general purpose I/O. In general purpose output mode the register bit value is
driven to the pin.
If the associated data direction bit is set to 1, a read returns the value of the port register bit, otherwise the buffered
pin input state is read.
4
PE
Port E general purpose input/output data—Data Register, ECLK output
When not used with the alternative function, the associated pin can be used as general purpose I/O. In general
purpose output mode the register bit value is driven to the pin.
If the associated data direction bit is set to 1, a read returns the value of the port register bit, otherwise the buffered
pin input state is read.
• The ECLK output function takes precedence over the general purpose I/O function if enabled.
1
PE
Port E general purpose input data and interrupt—Data Register,
IRQ input.
This pin can be used as general purpose and
IRQ input.
0
PE
Port E general purpose input data and interrupt—Data Register, XIRQ input.
This pin can be used as general purpose and
XIRQ input.
Address 0x0009 (PRR) Access: User read/write
1
1
Read: Anytime, the data source depends on the data direction value
Write: Anytime
76543210
R
DDRE7 DDRE6 DDRE5 DDRE4 DDRE3 DDRE2
00
W
Reset 00000000
= Unimplemented or Reserved
Figure 2-7. Port E Data Direction Register (DDRE)