C8051T600/1/2/3/4/5/6
27. C2 Interface
C8051T600/1/2/3/4/5/6 devices include an on-chip Silicon Labs 2-Wire (C2) debug interface to allow
EPROM programming and in-system debugging with the production part installed in the end application.
The C2 interface operates using only two pins: a bi-directional data signal (C2D), and a clock input
(C2CK). See the C2 Interface Specification for details on the C2 protocol.
27.1. C2 Interface Registers
The following describes the C2 registers necessary to perform EPROM programming functions through the
C2 interface. All C2 registers are accessed through the C2 interface as described in the C2 Interface Spec-
ification.
C2 Register Definition 27.1. C2ADD: C2 Address
Bit
Name
Type
Reset
0
0
0
0
7
6
5
4
3
2
1
0
C2ADD[7:0]
R/W
0
0
0
0
Bit
Name
Function
Selects the target Data register for C2 Data Read and Data Write commands accord-
ing to the following list.
Address
0x00
0x01
0x02
0xDF
0xBF
0xB7
0xAF
0xAE
0xA9
0xAA
0xAB
0xAC
Name
DEVICEID
REVID
DEVCTL
EPCTL
EPDAT
EPSTAT
EPADDRH
EPADDRL
CRC0
CRC1
CRC2
CRC3
Description
Selects the Device ID Register (read only)
Selects the Revision ID Register (read only)
Selects the C2 Device Control Register
Selects the C2 EPROM Programming Control Register
Selects the C2 EPROM Data Register
Selects the C2 EPROM Status Register
Selects the C2 EPROM Address High Byte Register
Selects the C2 EPROM Address Low Byte Register
Selects the CRC0 Register
Selects the CRC1 Register
Selects the CRC2 Register
Selects the CRC3 Register
7:0 C2ADD[7:0]
Write: C2 Address.
Read: C2 Status
Returns status information on the current programming operation.
When the MSB (bit 7) is set to ‘1’, a read or write operation is in progress. All other
bits can be ignored by the programming tools.
178
Rev. 1.2
SILABS [ SILICON LABORATORIES ]
