7906 datasheet(438/531 Pages) RENESAS

438 / 531 page

7906 Group User’s Manual Rev.2.0

20-33

APPENDIX

Appendix 2. Control registers

Notes 1: These bits are valid when the detect enable bit (bit 5) = “1.” Therefore, these bits must be set before or simultaneously with

setting of the detect enable bit to “1.”

2: At power-on reset, each bit becomes “0”; at hardware reset or software reset, each bit retains the value immediately

before reset.

Bit name

Bit

Debug control register 0 (Address 6616)

Function

Detect condition select bits

(Note 1)

Fix these bits to “00.”

Detect enable bit

Fix this bit to “0.”

The value is “1” at reading.

—

b7 b6 b5 b4 b3 b2 b1 b0

0 0 0 : Do not select.

0 0 1 : Address matching detection 0

0 1 0 : Address matching detection 1

0 1 1 : Address matching detection 2

1 0 0 : Do not select.

1 0 1 : Out-of-address-area detection

1 1 0 :

1 1 1 :

b2 b1 b0

0 : Detection disabled.

1 : Detection enabled.

(Note 2)

Do not select.

00 0

At reset

R/W

(Note 1)

Undefined

—

Bit name

Bit

Debug control register 1 (Address 6716)

Function

At reset

R/W

Fix this bit to “0.”

The value is “0” at reading.

Address compare register

access enable bit (Note 2)

Fix this bit to “1” when using the debug function.

Nothing is assigned.

While a debugger is not used, the value is “0” at reading.

While a debugger is used, the value is “1” at reading.

Address-matching-detection 2

decision bit

(Valid when the address match-

ing detection 2 is selected.)

The value is “0” at reading.

0 : Disabled.

1 : Enabled.

0 : Matches with the contents of the address com-

pare register 0.

1 : Matches with the contents of the address com-

pare register 1.

Notes 1: At power-on reset, each bit becomes “0”; at hardware reset or software reset, each bit retains the value immediately before reset.

2: Be sure to set this bit to “1” immediately before the access to the address compare registers 0 and 1 (addresses 6816 to

6D16). Then, be sure to clear this bit to “0” immediately after this access.

b7 b6 b5 b4 b3 b2 b1 b0

Address compare register 0 (Addresses 6A16 to 6816)

Address compare register 1 (Addresses 6D16 to 6B16)

Undefined

23 to 0

Bit

Function

At reset

R/W

The address to be detected (in other words, the start address of instructions) is set here.

(b23)

(b8)

(b15)

(b16)

Note: When accessing these registers, be sure to set the address compare register access enable bit (bit 2 at address 6716) to “1”

immediately before this access. Then, be sure to clear this bit to “0” immediately after this access.

Reference

17-3

Reference

17-4

Reference

17-5

7906 Datasheet(PDF) 438 Page - Renesas Technology Corp

7906 Datasheet(HTML) 438 Page - Renesas Technology Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL