Motorola ColdFire MCF5281 - Manual (Page 611)

Reset Controller Module
Freescale Semiconductor 29-3
29.4.1 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 29-2. 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.
—
7 6 5 4 0
Field SOFTRST FRCRSTOUT — LVDF LVDIE LVDRE — LVDE
Reset 0000_0101
R/W R/W
Address IPSBAR + 0x11_0000
Figure 29-2. Reset Control Register (RCR)
Table 29-3. 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.
4 LVDF LVD flag. Indicates the low-voltage detect status if LVDE is set. Write a 1 to clear the
LVDF bit.
1 Low voltage has been detected
0 Low voltage has not been detected
NOTE: The setting of this flag causes an LVD interrupt if LVDE and LVDIE bits are set
and LVDRE is cleared when the supply voltage V
DD
drops below V
DD
(minimum). The
vector for this interrupt is shared with INT0 of the EPORT module. Interrupt arbitration
in the interrupt service routine is necessary if both of these interrupts are enabled.
Also, LVDF is not cleared at reset, however it will always initialize to a zero since the
part will not come out of reset while in a low-power state (LVDE/LVDRE bits are
enabled out of reset).
MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3