MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
25-36
Freescale Semiconductor
NOTE
The EOC bits in DC1 must be programmed to trigger EVTO on watchpoint
occurrence for the EWC bits to have any effect.
25.11.2 Development Status Register (DS)
The development status register is used to report system debug status. When debug mode is entered or
exited, or an e200z6-defined low power mode is entered, a debug status message is transmitted with
DS[31:24]. The external tool can read this register at any time.
25.11.3 Read/Write Access Control/Status (RWCS)
The read write access control/status register provides control for read/write access. Read/write access
provides DMA-like access to memory-mapped resources on the system bus either while the processor is
halted, or during runtime. The RWCS register also provides read/write access status information as shown
in
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
R DBG
0
0
0
LPC
CHK
0
0
0
0
0
0
0
0
0
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Nexus Reg
0x4
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
R
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Nexus Reg
0x4
Figure 25-15. Development Status Register (DS)
Table 25-27. DS Field Descriptions
Bits
Name
Description
31–28
DBG
e200z6 CPU debug mode status.
0 CPU not in debug mode
1 CPU in debug mode
27–26
LPC
[1:0]
e200z6 CPU low power mode status.
00 Normal (run) mode
01 CPU in halted state
10 CPU in stopped state
11 Reserved
25
CHK
e200z6 CPU checkstop status.
0 CPU not in checkstop state
1 CPU in checkstop state
24–0
—
Reserved.
Summary of Contents for MPC5553
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