Motorola MC68VZ328 - Manual (Page 193)

Programming Model
I/O Ports 10-23
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 Port E Pull-up Enable Register 0x(FF)FFF422
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 Port E Select Register 0x(FF)FFF423
6 Data bit 6 RTS1
7 Data bit 7 CTS1
BIT 7 6 5 4 3 2 1 BIT 0
PU7 PU6 PU5 PU4 PU3 PU2 PU1 PU0
TYPE rw rw rw rw rw rw rw rw
RESET
1 1 1 1 1 1 1 1
0xFF
Table 10-29. Port E Pull-up Enable Register Description
Name Description Setting
PUx
Bits 7–0 Pull-up—These bits enable the pull-up resis-
tors on the port 0 = Pull-up resistors are disabled
1 = Pull-up resistors are enabled
BIT 7 6 5 4 3 2 1 BIT 0
SEL7 SEL6 SEL5 SEL4 SEL3 SEL2 SEL1 SEL0
TYPE rw rw rw rw rw rw rw rw
RESET
1 1 1 1 1 1 1 1
0xFF
Table 10-30. Port E Select Register Description
Name Description Setting
SELx
Bits 7–0 Select—These bits select whether the internal chip
function or I/O port signals are connected to the pins. 0 = The dedicated function pins are connected.
1 = The I/O port function pins are connected.
Table 10-28. Port E Dedicated Function Assignments (Continued)
Bit GPIO Function Dedicated I/O Function