C8051F350DK Silicon Laboratories Inc, C8051F350DK Datasheet - Page 117

• Manufacturer Part Number: C8051F350DK
• Description: DEV KIT FOR F350/351/352/353
• Manufacturer: Silicon Laboratories Inc
• Type: MCUr

Specifications of C8051F350DK

• Contents: Evaluation Board, Power Supply, USB Cables, Adapter and Documentation
• Processor To Be Evaluated: C8051F35x
• Interface Type: USB
• Silicon Manufacturer: Silicon Labs
• Core Architecture: 8051
• Silicon Core Number: C8051F350
• Silicon Family Name: C8051F35x
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: C8051F350, 351, 352, 353
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 336-1083

14.2. Power-Fail Reset /
When a power-down transition or power irregularity causes V
monitor will drive the /RST pin low and hold the CIP-51 in a reset state (see Figure 14.2). When V
returns to a level above V
nal data memory contents are not altered by the power-fail reset, it is impossible to determine if V
dropped below the level required for data retention. If the PORSF flag reads ‘1’, the data may no longer be
valid. The V
defined state (enabled/disabled) is not altered by any other reset source. For example, if the V
is disabled by software, and a software reset is performed, the V
reset. To protect the integrity of Flash contents, it is strongly recommended that the V
remain enabled and selected as a reset source if software contains routines which erase or write
Flash memory.
The V
reset source before it is enabled and stabilized may cause a system reset. The procedure for re-enabling
the V
See Figure 14.2 for V
See Table 14.1 for complete electrical characteristics of the V
Bit7:
Bit6:
Bits5–0: Reserved. Read = Variable. Write = don’t care.
VDMEN
DD
R/W
DD
Bit7
Step 1. Enable the V
Step 2. Wait for the V
Step 3. Select the V
monitor and configuring the V
monitor must be enabled before it is selected as a reset source. Selecting the V
VDMEN: V
This bit is turns the V
resets until it is also selected as a reset source in register RSTSRC (SFR Definition 14.2).
The V
ing the V
reset. See Table 14.1 for the minimum V
0: V
1: V
V
This bit indicates the current power supply status (V
0: V
1: V
DD
DD
V
DD
DD
DD
DD
DD
monitor is enabled and selected as a reset source after power-on resets; however its
Note: This delay should be omitted if software contains routines which erase or
write Flash memory.
STAT: V
Bit6
DD
R
STAT Reserved Reserved Reserved Reserved Reserved Reserved
Monitor Disabled.
Monitor Enabled (default).
is at or below the V
is above the V
SFR Definition 14.1. VDM0CN:
DD
Monitor must be allowed to stabilize before it is selected as a reset source. Select-
DD
DD
monitor timing; note that the reset delay is not incurred after a V
DD
monitor as a reset source before it has stabilized may generate a system
RST
Monitor Enable.
Status.
DD
, the CIP-51 will be released from the reset state. Note that even though inter-
Bit5
DD
R
DD
monitor as a reset source (PORSF bit in RSTSRC = ‘1’).
V
monitor (VDMEN bit in VDM0CN = ‘1’).
monitor to stabilize (see Table 14.1 for the V
DD
DD
DD
monitor circuit on/off. The V
monitor threshold.
Monitor
DD
DD
Bit4
R
monitor as a reset source is shown below:
monitor threshold.
Rev. 1.1
Bit3
R
DD
Monitor turn-on time.
V
DD
DD
Bit2
DD
R
DD
DD
monitor.
Monitor Control
DD
to drop below V
Monitor output).
Monitor cannot generate system
monitor will still be disabled after the
C8051F350/1/2/3
Bit1
R
DD
Monitor turn-on time).
SFR Address:
RST
Bit0
R
, the power supply
DD
DD
monitor reset.
0xFF
monitor as a
Reset Value
DD
Variable
DD
monitor
monitor
117
DD
DD