RX610 Group
28. Boundary Scan
R01UH0032EJ0120 Rev.1.20
Page 938 of 1006
Feb 20, 2013
Table 28.2 shows the I/O pins used in the boundary scan function.
Table 28.2 Pin Configuration
Pin Name
I/O
Description
TCK
Input
Test clock input pin
Clock signal for boundary scan. Input the clock the duty cycle of which is 50 percent when
boundary scan function is used.
TMS
Input
Test mode select pin
TDI
Input
Test data input pin
TDO
Output
Test data output pin
TRST
Input
Test reset input pin
28.2
Register Descriptions
Table 28.3 lists the boundary scan registers.
Register Name
Symbol
Value after Reset
Address
Access Size
Instruction register
JTIR
4h
4
Bypass register
JTBPR
Undefinded
1
Boundary scan register
JTBSR
Undefinded
IDCODE register
JTIDR
0809 9447h
32
Instructions can be input to the instruction register (JTIR) via the test data input pin (TDI) by serial transfer.
The bypass register (JTBPR), which is a 1-bit register, is connected between the TDI and TDO pins in BYPASS mode.
The boundary scan register (JTBSR), which is a JTBSR-bit register (see table 28.6), is connected between the TDI and
TDO pins when test data are being shifted in.
None of the registers is accessible from the CPU.
Table 28.4 shows the availability of serial transfer for the registers.
Table 28.4 Serial Transfers for Registers
Register Abbreviation
Serial Input
Serial Output
JTIR
Available
Available
JTBPR
Available
Available
JTBSR
Available
Available
JTID
Available
Available