C8051F300DK Silicon Laboratories Inc, C8051F300DK Datasheet - Page 175

• Manufacturer Part Number: C8051F300DK
• Description: DEV KIT F300/301/302/303/304/305
• Manufacturer: Silicon Laboratories Inc
• Type: MCUr

Specifications of C8051F300DK

• Contents: Evaluation Board, Power Supply, USB Cables, Adapter and Documentation
• Processor To Be Evaluated: C8051F30x
• Interface Type: USB
• Silicon Manufacturer: Silicon Labs
• Core Architecture: 8051
• Silicon Core Number: C8051F300
• Silicon Family Name: C8051F30x
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: Silicon Laboratories C8051 F300/001/002
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 336-1246

17.2. C2 Pin Sharing
The C2 protocol allows the C2 pins to be shared with user functions so that in-system debugging and
Flash programming functions 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 (normally RST) and C2D (normally P0.7)
pins. In most applications, external resistors are required to isolate C2 interface traffic from the user appli-
cation. A typical isolation configuration is shown in Figure 17.1.
The configuration in Figure 17.1 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 17.1. Typical C2 Pin Sharing
C2 Interface Master
Rev. 2.9
C8051F300/1/2/3/4/5
C8051F300
C2CK (/RST)
C2D (P0.7)
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