C8051F330-TB Silicon Laboratories Inc, C8051F330-TB Datasheet - Page 207
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C8051F330-TB
Manufacturer Part Number
C8051F330-TB
Description
BOARD PROTOTYPING W/C8051F330
Manufacturer
Silicon Laboratories Inc
Type
MCUr
Specifications of C8051F330-TB
Contents
Board
Processor To Be Evaluated
C8051F33x
Interface Type
RS-232, UART
Operating Supply Voltage
7 V to 15 V
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
C8051F330
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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20.2. C2 Pin Sharing
The C2 protocol allows the C2 pins to be shared with user functions so that in-system debugging and
Flash programming may be performed. This is possible because C2 communication is typically performed
when the device is in the halt state, where all on-chip peripherals and user software are stalled. In this
halted state, the C2 interface can safely ‘borrow’ the C2CK (RST) and C2D (P2.0) pins. In most applica-
tions, external resistors are required to isolate C2 interface traffic from the user application. A typical isola-
tion configuration is shown in Figure 20.1.
The configuration in Figure 20.1 assumes the following:
Additional resistors may be necessary depending on the specific application.
1. The user input (b) cannot change state while the target device is halted.
2. The RST pin on the target device is used as an input only.
/Reset (a)
Output (c)
Input (b)
Figure 20.1. Typical C2 Pin Sharing
C2 Interface Master
Rev. 1.7
C8051F330/1/2/3/4/5
C2CK
C2D
C8051Fxxx
211
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