RX610 Group
28. Boundary Scan
R01UH0032EJ0120 Rev.1.20
Page 939 of 1006
Feb 20, 2013
28.2.1
Instruction Register (JTIR)
b3
b2
b1
b0
Value after reset:
0
1
0
0
TS[3:0]
Bit
Symbol
Bit Name
Description
R/W
b3 to b0
TS[3:0]
Test Bit Set
The command configuration is as shown in table 28.5.
Table 28.5 Command Configuration
TS3
TS2
TS1
TS0
Instruction
0
0
0
0
EXTEST
0
0
0
1
SAMPLE/PRELOAD
0
1
0
0
IDCODE (initial value)
0
1
1
0
CLAMP
0
1
1
1
HIGHZ
1
1
1
1
BYPASS
Other than above
Reserved
JTIR is a 4-bit register.
JTAG instructions can be transferred to JTIR by serial input from the TDI pin.
JTIR is initialized when the TRST signal is low level, when the TAP controller is in the Test-Logic-Reset state.
28.2.2
Bypass Register (JTBPR)
JTBPR is a 1-bit register and is connected between the TDI and TDO pins when JTIR is set to BYPASS mode.
JTBPR cannot be read from or written to by the CPU.
28.2.3
Boundary Scan Register (JTBSR)
JTBSR is a shift register to control the external input and output pins of this LSI and is distributed across the pads.
The EXTEST, SAMPLE/PRELOAD, CLAMP, and HIGHZ instructions are issued to apply JTBSR in boundary-scan
testing conformant to the JTAG standard.
Table 28.6 shows the correspondence between the JTBSR bits and the pins of this LSI.
The value after reset is undefined.