Microcontroller User's Manual

MOTOROLA Chapter 28. Reset Controller Module 28-3
Memory Map and Registers
28.4 Memory Map and Registers
The reset controller programming model consists of these registers:
• Reset control register (RCR), which selects reset controller functions
• Reset status register (RSR), which reflects the state of the last reset source
See Table 28-2 for the memory map and the following paragraphs for a description of the
registers.
28.4.1 Reset Control Register (RCR)
The RCR allows software control for requesting a reset, for independently asserting the
external RSTO
pin, and for controlling low-voltage detect (LVD) functions.
Table 28-2. Reset Controller Memory Map
IPSBAR Offset Bits 7:0 Access
1
1
S/U = supervisor or user mode access.
0x11_0000 RCR S/U
0x11_0001 RSR S/U
0x11_0002 Reserved
2
—
0x11_0003 Reserved
2
2
Writes to reserved address locations have no effect and reads return 0s.
—
7654 0
Field SOFTRST FRCRSTOUT — LVDF LVDIE LVDRE — LVDE
Reset 0000_0101
R/W R/W
Address IPSBAR + 0x11_0000
Figure 28-2. Reset Control Register (RCR)
Table 28-3. RCR Field Descriptions
Bit(s) Name Description
7 SOFTRST Allows software to request a reset. The reset caused by setting this bit clears this bit.
1 Software reset request
0 No software reset request
6 FRCRSTOUT Allows software to assert or negate the external RSTO
pin.
1 Assert RSTO
pin
0 Negate RSTO pin
CAUTION: External logic driving reset configuration data during reset needs to be considered
when asserting the RSTO
pin when setting FRCRSTOUT.
5 — Reserved, should be cleared.