PXD20RM Datasheet, PDF (1044/1628 Pages) Freescale Semiconductor, Inc – PXD20 Microcontroller

Offset
address
Register name
0x083C
0x0840-
0x3FFF
MPU_RGDAAC15
Reserved
Table 28-1. MPU memory map (continued)
Register description
MPU RGD Alternate Access Control 15
Size
(bits)
32
Access Location
R/W on page 28-13
28.2.2 Register description
The following sections detail the individual registers within the MPU’s programming model.
28.2.2.1 MPU Control/Error Status Register (MPU_CESR)
The MPU_CESR provides one byte of error status plus three bytes of configuration information. A global
MPU enable/disable bit is also included in this register.
Offset MPU_Base + 0x000
Access: Read/Partial Write
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
R
SPERR
W
w1c
1000
HRL
NSP
NRGD
0 0 0 0 0 0 0 VL
D
Reset _{0 0 0 0 0 0 0 0 1 0 0 0 * * * * 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 0}
Figure 28-2. MPU Control/Error Status Register (MPU_CESR)
Table 28-2. MPU_CESR field descriptions
Field
Description
SPERR
HRL
NSP
Slave Port n Error, where the slave port number matches the bit number. Each bit in this field represents
a flag maintained by the MPU for signaling the presence of a captured error contained in the
MPU_EARn and MPU_EDRn registers. The individual bit is set when the hardware detects an error and
records the faulting address and attributes. It is cleared when the corresponding bit is written as a
logical one. If another error is captured at the exact same cycle as a write of a logical one, this flag
remains set. A “find first one” instruction (or equivalent) can be used to detect the presence of a
captured error.
0 The corresponding MPU_EARn/MPU_EDRn registers do not contain a captured error.
1 The corresponding MPU_EARn/MPU_EDRn registers do contain a captured error.
Hardware Revision Level. This 4-bit read-only field specifies the MPU’s hardware and definition revision
level. It can be read by software to determine the functional definition of the module.
Number of Slave Ports. This 4-bit read-only field specifies the number of slave ports [1-8] connected to
the MPU. This field contains values of 0b0001-0b1000, depending on the device configuration.
The PXD20 has 4 slaves connected to the MPU.
28-6
PXD20 Microcontroller Reference Manual, Rev. 1
Preliminary—Subject to Change Without Notice
Freescale Semiconductor