Freescale Semiconductor PowerQUICC MPC870, Reference Manual

Page: 929 / 1426

Parallel I/O Ports
MPC885 PowerQUICC Family Reference Manual, Rev. 2
Freescale Semiconductor 34-11
34.3.1.4 Port B Pin Assignment Register (PBPAR)
The port B pin assignment register (PBPAR) configures signals as general-purpose I/O or dedicated for
use with a peripheral.
This register is affected by HRESET but is not affected by SRESET. Table 34-10 describes PBPAR bits.
34.4 Port C
Port C consists of 12 general-purpose I/O signals that can generate interrupts, which are managed by the
CPM interrupt controller (CPIC).
Table 34-11 lists port C signal options.
Table 34-9. PBDIR Bit Descriptions
Bits Name Description
0–13 — Reserved
14 –31 DR n Port B data direction. Configures port B signals as inputs or outputs when functioning as
general-purpose I/O; otherwise, used to select the peripheral function.
0 Select the signal for general-purpose input, or select peripheral function 0.
1 Select the signal for general-purpose output, or select peripheral function 1.
DR14 and DR15 are ignored when port B is used by the PIP controller.
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Field — DD14 DD15
Reset — — — — — — — — — — — — — — 0 0
R/W — R/W R/W
Addr 0xABC
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
Field DD16 DD17 DD18 DD19 DD20 DD21 DD22 DD23 DD24 DD25 DD26 DD27 DD28 DD29 DD30 DD31
Reset 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
Addr 0xABE
Figure 34-10. Port B Pin Assignment Register (PBPAR)
Table 34-10. PBPAR Bit Descriptions
Bits Name Description
0–13 — Reserved
14 –31 DD n Port assignment. Determines whether a signal is configured for general-purpose I/O or
dedicated peripheral function.
0 General-purpose I/O. The peripheral functions of the signal are not used.
1 Dedicated peripheral function. The signal is used by the internal module. The on-chip
peripheral function to which it is dedicated can be determined by other bits such as those in
the PBDIR.