Renesas M32R/ECU Series User Manual page 722

19
19.2 Configuration of the JTAG Circuit
The JTAG circuit included in the M32R/ECU consists of several circuit blocks as shown in Figure 19.2.1.
• Instruction register to hold the instruction code that is fetched through the boundary-scan path
• A set of registers which are accessed through the boundary-scan path (boundary-scan register, bypass regis-
ter and ID code register)
• Test access port (abbreviated TAP) controller to control the JTAG unit's state transition
• Control logic to select input, output, etc.
M32R/ECU
JTDI
JTMS
JTCK
JTRST
Figure 19.2.1 Configuration of the JTAG Circuit
Data register set
Boundary Scan Register
(JTAGBSR)
Bypass Register
(JTAGBPR)
ID Code Register
(JTAGIDR)
Decoder
Instruction Register (6-bit)
(JTAGIR)
TAP Controller
19-3
19.2 Configuration of the JTAG Circuit
32180 Group User's Manual (Rev.1.0)
JTAG
JTDO