C8051F555-IMR Silicon Labs, C8051F555-IMR Datasheet - Page 138

• Manufacturer Part Number: C8051F555-IMR
• Description: 8-bit Microcontrollers - MCU 50 MIPS 16 kB 2 kB CAN2.0 SPI
• Manufacturer: Silicon Labs

Specifications of C8051F555-IMR

• Rohs: yes
• Core: 8051
• Processor Series: C8051
• Data Bus Width: 8 bit

C8051F55x/56x/57x
Important Note: If the V
is selected as a reset source. Selecting the V
lized may cause a system reset. In some applications, this reset may be undesirable. If this is not desirable
in the application, a delay should be introduced between enabling the monitor and selecting it as a reset
source. The procedure for enabling the V
state is as follows:
1. Enable the V
2. If necessary, wait for the V
3. Select the V
See Figure 16.2 for V
monitor reset. See Table 5.4 for complete electrical characteristics of the V
Note: The output of the internal voltage regulator is calibrated by the MCU immediately after any reset event. The
When programming the Flash in-system, the V
highest system reliability, the time the V
(e.g., setting the V
changing it back to the low threshold setting immediately after the Flash write operation).
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Note: This delay should be omitted if software contains routines that erase or write Flash
memory.
output of the un-calibrated internal regulator could be below the high threshold setting of the V
is the case and the V
reset (POR), the MCU will remain in reset until a POR occurs (i.e., V
POR will force the V
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 V
value upon POR).
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monitor as a reset source (PORSF bit in RSTSRC = 1).
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monitor (VDMEN bit in VDM0CN = 1).
Monitor to the high threshold setting just before the Flash write operation and then
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monitor timing; note that the power-on-reset delay is not incurred after a V
Monitor to the low threshold setting which is guaranteed to be below the un-calibrated
monitor is being turned on from a disabled state, it should be enabled before it
Monitor is set to the high threshold setting and if the MCU receives a non-power on
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monitor to stabilize (see Table 5.4 for the V
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Monitor is set to the high threshold setting should be minimized
monitor and configuring it as a reset source from a disabled
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Rev. 1.1
monitor as a reset source before it is enabled and stabi-
Monitor must be set to the high threshold setting. For the
Monitor is always left in the low threshold setting (i.e. default
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Monitor will keep the device in reset). A
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monitor.
Monitor turn-on time). 
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Monitor. If this
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