Operation; Tap Controller State Transitions; H-Udi Reset; Figure 25.2 Tap Controller State Transitions - Renesas H8S/2158 User Manual

25.4

Operation

25.4.1

TAP Controller State Transitions

Figure 25.2 shows the internal states of the TAP controller. State transitions basically conform to
the IEEE1149.1 standard.
1
Tset -Logic-Reset
0
0
Run-Test/Idle
25.4.2

H-UDI Reset

The H-UDI can be reset in two ways.
• The H-UDI is reset when the ETRST pin is held at 0.
• When ETRST = 1, the H-UDI can be reset by inputting at least five ETCK clock cycles while
ETMS = 1.
1
Select-DR-Scan
0
1
Capture-DR
0
Shift-DR
1
Exit1-DR
0
Pause-DR
1
0
Exit2-DR
1
Update-DR
1

Figure 25.2 TAP Controller State Transitions

Section 25 User Debug Interface (H-UDI)
1
Select-IR-Scan
1
0
1
0
0
0
Rev. 3.00 Jan 25, 2006 page 755 of 872
1
0
Capture-IR
0
0
Shift-IR
1
1
Exit1-IR
0
0
Pause-IR
1
Exit2-IR
1
Update-IR
1 0
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