Specifications

C8051F330/1
Rev. 1.1 201
20. C2 INTERFACE
C8051F330/1 devices include an on-chip Silicon Labs 2-Wire (C2) debug interface to allow FLASH programming,
boundary scan functions, and in-system debugging with the production part installed in the end application. The C2
interface uses a clock signal (C2CK) and a bi-directional C2 data signal (C2D) to transfer information between the
device and a host system. See the C2 Interface Specification for details on the C2 protocol.
20.1. C2 Interface Registers
The following describes the C2 registers necessary to perform FLASH programming and boundary scan functions
through the C2 interface. All C2 registers are accessed through the C2 interface as described in the C2 Interface Spec
-
ification.
Figure 20.1. C2ADD: C2 Address Register
Bits7-0: The C2ADD register is accessed via the C2 interface to select the target Data register for C2 Data
Read and Data Write commands.
Reset Value
00000000
Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
Address Description
0x00 Selects the Device ID register for Data Read instructions
0x01 Selects the Revision ID register for Data Read instructions
0x02
Selects the C2 FLASH Programming Control register for Data
Read/Write instructions
0xB4
Selects the C2 FLASH Programming Data register for Data Read/Write
instructions
Figure 20.2. DEVICEID: C2 Device ID Register
This read-only register returns the 8-bit device ID: 0x0A (C8051F330/1).
Reset Value
00001010
Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0