C8051F321-GMR Silicon Laboratories Inc, C8051F321-GMR Datasheet - Page 101

• Manufacturer Part Number: C8051F321-GMR
• Description: IC 8051 MCU 16K FLASH 28MLP
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F32xr

Specifications of C8051F321-GMR

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: SMBus (2-Wire/I²C), SPI, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
• Number Of I /o: 21
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: FLASH
• Ram Size: 2.25K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Data Converters: A/D 13x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-VQFN Exposed Pad, 28-HVQFN, 28-SQFN, 28-DHVQFN
• Processor Series: C8051F3x
• Core: 8051
• Data Bus Width: 8 bit
• Data Ram Size: 2.25 KB
• Interface Type: I2C, SMBus, SPI, UART, USB
• Maximum Clock Frequency: 25 MHz
• Number Of Programmable I/os: 21
• Number Of Timers: 4
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Development Tools By Supplier: C8051F320DK
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 13 Channel / 10 bit, 7 Channel
• Package: 28MLP
• Device Core: 8051
• Family Name: C8051F321
• Maximum Speed: 25 MHz
• Operating Supply Voltage: 3.3 V
• For Use With: 336-1480 - DAUGHTER CARD TOOLSTCK C8051F321336-1449 - ADAPTER PROGRAM TOOLSTICK F321336-1260 - DEV KIT FOR C8051F320/F321
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

10.2. Power-Fail Reset / VDD Monitor
When a power-down transition or power irregularity causes VDD to drop below V
monitor will drive the /RST pin low and hold the CIP-51 in a reset state (see Figure 10.2). When VDD
returns to a level above V
nal data memory contents are not altered by the power-fail reset, it is impossible to determine if VDD
dropped below the level required for data retention. If the PORSF flag reads ‘1’, the data may no longer be
valid. The VDD monitor is enabled after power-on resets; however its defined state (enabled/disabled) is
not altered by any other reset source. For example, if the VDD monitor is enabled and a software reset is
performed, the VDD monitor will still be enabled after the reset.
Important Note: The VDD monitor must be enabled before it is selected as a reset source. Selecting the
VDD monitor as a reset source before it is enabled and stabilized will cause a system reset. The procedure
for configuring the VDD monitor as a reset source is shown below:
See Figure 10.2 for VDD monitor timing. See Table 10.1 for complete electrical characteristics of the VDD
monitor.
Bit7:
Bit6:
Bits5–0: Reserved. Read = Variable. Write = don’t care.
VDMEN VDDSTAT Reserved Reserved Reserved Reserved Reserved Reserved
R/W
Bit7
Step 1. Enable the VDD monitor (VDM0CN.7 = ‘1’).
Step 2. Wait for the VDD monitor to stabilize (see Table 10.1 for the VDD Monitor turn-on time).
Step 3. Select the VDD monitor as a reset source (RSTSRC.1 = ‘1’).
VDMEN: VDD Monitor Enable.
This bit turns the VDD monitor circuit on/off. The VDD Monitor cannot generate system
resets until it is also selected as a reset source in register RSTSRC (Figure 10.2). The VDD
Monitor must be allowed to stabilize before it is selected as a reset source. Selecting the
VDD monitor as a reset source before it has stabilized will generate a system reset.
See Table 10.1 for the minimum VDD Monitor turn-on time. The VDD Monitor is enabled fol-
lowing all POR resets.
0: VDD Monitor Disabled.
1: VDD Monitor Enabled.
VDDSTAT: VDD Status.
This bit indicates the current power supply status (VDD Monitor output).
0: VDD is at or below the VDD monitor threshold.
1: VDD is above the VDD monitor threshold.
Bit6
R
SFR Definition 10.1.
RST
Bit5
, the CIP-51 will be released from the reset state. Note that even though inter-
R
Bit4
R
VDM0CN: VDD Monitor Control
Rev. 1.4
Bit3
R
Bit2
R
Bit1
R
C8051F320/1
RST
Bit0
R
, the power supply
SFR Address:
Reset Value
Variable
0xFF
101