C8051T630 Datasheet, PDF (210/221 Pages) Silicon Laboratories – Mixed-Signal Byte-Programmable EPROM MCU

C8051T630/1/2/3/4/5
26. C2 Interface
C8051T630/1/2/3/4/5 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.
26.1. 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 26.1. C2ADD: C2 Address
Bit
7
6
5
4
3
2
1
0
Name
C2ADD[7:0]
Type
R/W
Reset
0
0
0
0
0
0
0
0
Bit Name
Function
7:0 C2ADD[7:0] _{Write: C2 Address.}
Selects the target Data register for C2 Data Read and Data Write commands accord-
ing to the following list.
Address Name
Description
0x00
0x01
0x02
0xDF
0xBF
0xB7
0xAF
0xAE
0xA9
0xAA
0xAB
0xAC
DEVICEID Selects the Device ID Register (read only)
REVID Selects the Revision ID Register (read only)
DEVCTL Selects the C2 Device Control Register
EPCTL Selects the C2 EPROM Programming Control Register
EPDAT Selects the C2 EPROM Data Register
EPSTAT Selects the C2 EPROM Status Register
EPADDRH Selects the C2 EPROM Address High Byte Register
EPADDRL Selects the C2 EPROM Address Low Byte Register
CRC0
Selects the CRC0 Register
CRC1
Selects the CRC1 Register
CRC2
Selects the CRC2 Register
CRC3
Selects the CRC3 Register
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.
210
Rev. 1.0