C8051F2XX Datasheet, PDF (143/146 Pages) Silicon Laboratories – Mixed Signal 8 kB ISP Flash MCU Family

C8051F2xx
18.2. Boundary Scan Bypass and ID Code
The MCU does not support boundary scan (IEEE 1149.1), however, it does support the bypass and ID
code functions. Because the MCU utilizes JTAG for Flash memory programming and debug support, and
other devices in a system may use JTAG boundary scan, the MCU supports being placed in BYPASS so
the user may maintain a single JTAG port for a system. Additionally, the MCU supports an ID code.
18.2.1. BYPASS Instruction
The BYPASS instruction is accessed via the IR. It provides access to the standard 1-bit JTAG Bypass data
register.
18.2.2. IDCODE Instruction
The IDCODE instruction is accessed via the IR. It provides access to the 32-bit Device ID register.
JTAG Register Definition 18.6. DEVICEID: JTAG Device ID
Version
Part Number
Manufacturer ID
Bit31
Bit28 Bit27
Bit12 Bit11
Reset Value
1 0xn0000243
Bit1 Bit0
Version = 0000b (Revision A)
= 0001b (Revision B)
Part Number = 0000 0000 0000 0001b (C8051F206/220/1/6, C8051F230/1/6)
Manufacturer ID = 0010 0100 001b (Silicon Laboratories)
18.3. Debug Support
The MCU has on-chip JTAG and debug circuitry that provide non-intrusive, full speed, in-circuit debug
using the production part installed in the end application using the four pin JTAG I/F. Silicon Labs' debug
system supports inspection and modification of memory and registers, breakpoints, stack tracing, and sin-
gle stepping. No additional target RAM, program memory, or communications channels are required. All
the digital and analog peripherals are functional and work correctly (remain in sync) while emulating. The
WDT is disabled when the MCU is halted during single stepping or at a breakpoint.
The C8051F2xxDK is a development kit with all the hardware and software necessary to develop applica-
tion code and perform in-circuit debugging with the C8061F206, C8051F220/1/6 and C8051F230/1/6. The
kit includes an Integrated Development Environment (IDE) which has a debugger and integrated 8051
assembler. It has an RS-232 to JTAG interface module referred to as the EC. The kit also includes RS-
232 and JTAG cables, and wall-mount power supply.
Rev. 1.6
143