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System and Peripheral Control Registers
225
SPNU563A–March 2018
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Architecture
2.5.3.5 Peripheral Protection Set Register 0 (PPROTSET0)
There is one bit for each quadrant for PS0 to PS7.
The following are the ways that quadrants are used within a PS frame:
a. The slave uses all the four quadrants.
Only the bit corresponding to the quadrant 0 of PSn is implemented. It protects the whole 1K-byte
frame. The remaining three bits are not implemented.
b. The slave uses two quadrants.
Each quadrant has to be in one of these groups: (Quad 0 and Quad 1) or (Quad 2 and Quad 3).
For the group Quad0/Quad1, the bit quadrant 0 protects both quadrants 0 and 1. The bit quadrant 1 is
not implemented.
For the group Quad2/Quad3, the bit quadrant 2 protects both quadrants 2 and 3. The bit quadrant 3 is
not implemented
c. The slave uses only one quadrant.
In this case, the bit, as specified in Table 2-90, protects the slave.
The above arrangement is true for all the peripheral selects (PS0 to PS31), presented in Section 2.5.3.6 -
Section 2.5.3.12. This register holds bits for PS0 to PS7 and is shown in Figure 2-76 and described in
Table 2-90.
NOTE: Writes to unimplemented bits have no effect and reads are 0.
Figure 2-76. Peripheral Protection Set Register 0 (PPROTSET0) (offset = 20h)
31 0
PS[7-0]QUAD[3-0]PROTSET
R/WP-0
LEGEND: R/W = Read/Write; WP = Write in privileged mode only; -n = value after reset
Table 2-90. Peripheral Protection Set Register 0 (PPROTSET0) Field Descriptions
Bit Field Value Description
31-0 PS[7-0]QUAD[3-0]
PROTSET
Peripheral select quadrant protection set.
0 Read: The peripheral select quadrant an be written to and read from in both user and
privileged modes.
Write: The bit is unchanged.
1 Read: The peripheral select quadrant can be written to only in privileged mode, but it can be
read in both user and privileged modes.
Write: The corresponding bit in PPROTSET0 and PPROTCLR0 registers is set to 1.
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