Freescale Semiconductor MPC5553 - Page 296

MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor 7-5
012 3 456789101112131415
R000 0 000000000000
W
Reset for
MPC5554
000 0 000000000000
Reset for
MPC5553
000 0 000000000000
Reg Addr Base + 0x0000 (XBAR_MPR0); 0x0100 (XBAR_MPR1); 0x0300 (XBAR_MPR3); 0x0600 (XBAR_MPR6);
0x0700 (XBAR_MPR7)
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
R0 0 MSTR3
1
1
MSTR3 is supported only in the MPC5553.
0 0 MSTR2 0 0 MSTR1 0 0 MSTR0
W
Reset for
MPC5554
000 0 001000010000
Reset for
MPC5553
001 1 001000010000
Reg Addr Base + 0x0000 (XBAR_MPR0); 0x0100 (XBAR_MPR1); 0x0300 (XBAR_MPR3); 0x0600 (XBAR_MPR6);
0x0700 (XBAR_MPR7)
Figure 7-2. Master Priority Registers (XBAR_MPRn)
Table 7-3. XBAR_MPRn Descriptions
Bits Name Description
0–17 — Reserved, should be cleared.
18-19 MSTR3 Master 3 priority. Set the arbitration priority for master port 3 on the associated slave port.
00 This master has the highest priority when accessing the slave port.
01 This master has the 2nd highest priority when accessing the slave port
10 This master has the 3rd highest priority when accessing the slave port.
11 This master has the lowest priority when accessing the slave port.
Note: This field is supported only in the MPC5553.
Note: In the MPC5554, this master is not used. Setting its value to its reset value (0b011)
insures that it does not conflict with other master priorities.
20-21 — Reserved, should be cleared.
22–23 MSTR2 Master 2 priority. Set the arbitration priority for master port 2 on the associated slave port.
00 This master has the highest priority when accessing the slave port.
01 This master has the 2nd highest priority when accessing the slave port
10 This master has the 3rd highest priority when accessing the slave port.
11 This master has the lowest priority when accessing the slave port.
24–25 — Reserved, should be cleared.