C8051F521A-IM Silicon Laboratories Inc, C8051F521A-IM Datasheet - Page 108

• Manufacturer Part Number: C8051F521A-IM
• Description: IC 8051 MCU 8K FLASH 10DFN
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F52xr

Specifications of C8051F521A-IM

• Program Memory Type: FLASH
• Program Memory Size: 8KB (8K x 8)
• Package / Case: 10-DFN
• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
• Number Of I /o: 6
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.25 V
• Data Converters: A/D 6x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Processor Series: C8051F5x
• Core: 8051
• Data Bus Width: 8 bit
• Data Ram Size: 256 B
• Interface Type: SPI/UART
• Maximum Clock Frequency: 25 MHz
• Number Of Programmable I/os: 6
• Number Of Timers: 3
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Development Tools By Supplier: C8051F500DK
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 6-ch x 12-bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 336-1488 - KIT DEV C8051F53XA, C8051F52XA770-1006 - ISP 4PORT FOR SILABS C8051F MCU336-1455 - ADAPTER PROGRAM TOOLSTICK F520
• Eeprom Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 336-1490-5

C8051F52x/F52xA/F53x/F53xA
software, and a software reset is performed, the V
tect the integrity of Flash contents, the V
(VDMLVL = '1') and selected as a reset source if software contains routines which erase or write
Flash memory. If the V
will cause a Flash Error device reset.
The V
as a reset source before it is enabled and stabilized may cause a system reset. The procedure for re-
enabling the V
1. Enable the V
2. Wait for the V
3. Select the V
See Figure 11.2 for V
See Table 2.7 on page 32 for complete electrical characteristics of the V
Note: Software should take care not to inadvertently disable the V
ing to RSTSRC to enable other reset sources or to trigger a software reset. All writes to RSTSRC should
explicitly set PORSF to '1' to keep the V
Note: The output of the internal voltage regulator is calibrated by the MCU immediately after any reset
event. The output of the un-calibrated internal regulator could be below the high threshold setting of the
VDD Monitor. If this is the case and the VDD Monitor is set to the high threshold setting and if the MCU
receives a non-power on reset (POR), the MCU will remain in reset until a POR occurs (i.e. VDD Monitor
will keep the device in reset). A POR will force the VDD Monitor to the low threshold setting which is guar-
anteed to be below the un-calibrated output of the internal regulator. The device will then exit reset and
resume normal operation. It is for this reason Silicon Labs strongly recommends that the VDD Monitor is
always left in the low threshold setting (i.e., default value upon POR).
When programming the Flash in-system, the VDD Monitor must be set to the high threshold setting. For
the highest system reliability, the time the VDD Monitor is set to the high threshold setting should be mini-
mized (e.g., setting the VDD Monitor to the high threshold setting just before the Flash write operation and
then changing it back to the low threshold setting immediately after the Flash write operation).
108
This delay should be omitted if software contains routines which write or erase Flash memory.
DD
monitor must be enabled before it is selected as a reset source. Selecting the V
DD
DD
DD
DD
monitor and configuring the V
monitor as a reset source (PORSF bit in RSTSRC = 1).
monitor (VDMEN bit in VDDMON = 1).
monitor to stabilize (see Table 2.7 on page 32 for the V
DD
DD
monitor timing; note that the reset delay is not incurred after a V
monitor is not enabled, any erase or write performed on Flash memory
DD
Monitor enabled as a reset source.
DD
DD
Rev. 1.3
monitor as a reset source is shown below:
DD
monitor must be enabled to the higher setting
monitor will still be disabled after the reset. To pro-
DD
Monitor as a reset source when writ-
DD
DD
monitor.
Monitor turn-on time). Note:
DD
monitor reset.
DD
monitor