Port E Pull-Up Enable Register; Port E Select Register; Table 10-29 Port E Pull-Up Enable Register Description; Table 10-30 Port E Select Register Description - Motorola MC68VZ328 User Manual

Table 10-28. Port E Dedicated Function Assignments (Continued)
Bit
6
7
10.4.6.4

Port E Pull-up Enable Register

The Port E pull-up enable register (PEPUEN) controls the pull-up resistors for each line in Port E. The
settings for the bit positions of the PEPUEN register are shown in Table 10-29.
PEPUEN
BIT 7
PU7
TYPE
RESET
Table 10-29. Port E Pull-up Enable Register Description
Name
PUx Pull-up—These bits enable the pull-up resis-
Bits 7–0 tors on the port
10.4.6.5

Port E Select Register

The Port E select register (PESEL) determines if a bit position in the Port E data register (PEDATA) is
assigned as a GPIO or to a dedicated I/O function. The settings for the bit positions of the PEDIR register
are shown in Table 10-30.
PESEL
BIT 7
SEL7
TYPE
RESET
Name
SELx Select—These bits select whether the internal chip
Bits 7–0 function or I/O port signals are connected to the pins.
GPIO Function
Port E Pull-up Enable Register
6 5
PU6 PU5
rw rw rw
1 1 1
Description
Port E Select Register
6 5
SEL6 SEL5
rw rw rw
1 1 1
Table 10-30. Port E Select Register Description
Description
I/O Ports
Dedicated I/O Function
Data bit 6
Data bit 7
4 3
PU4 PU3
rw rw
1 1
0xFF
0 = Pull-up resistors are disabled
1 = Pull-up resistors are enabled
4 3
SEL4 SEL3
rw rw
1 1
0xFF
0 = The dedicated function pins are connected.
1 = The I/O port function pins are connected.
Programming Model
RTS1
CTS1
0x(FF)FFF422
2 1 BIT 0
PU2 PU1 PU0
rw rw rw
1 1 1
Setting
0x(FF)FFF423
2 1 BIT 0
SEL2 SEL1 SEL0
rw rw rw
1 1 1
Setting
10-23