SH7616 datasheet(283/935 Pages) RENESAS

283 / 935 page

Section 7 Bus State Controller (BSC)

Rev. 2.00 Mar 09, 2006 page 257 of 906

REJ09B0292-0200

7.2

7.2.1

Bus Control Register 1 (BCR1)

Bit:

—

A4LW1 A4LW0

A2EN

DIAN

BST

ROM

—AHLW1 AHLW0

Initial value:

000001

R/W:

R/W

Bit:

76543210

A1LW1 A1LW0 A0LW1 A0LW0

A4EN

DIAN

DRAM2 DRAM1 DRAM0

Initial value:

11110000

R/W:

R/W

Initialize the ENDIAN, BSTROM, PSHR, and DRAM2–DRAM0 bits after a power-on reset, and

do not change their values thereafter. To change other bits by writing to them, write the same

value as they are initialized to. Do not access any space other than CS0 until the register

initialization ends.

Bit 15—Reserved: This bit is always read as 0. The write value should always be 0.

Bits 14 and 13—Long Wait Specification for Area 4 (A4LW1, A4LW0): From 3 to 14 wait cycles

are inserted in CS4 space accesses when the wait control bits (W41, W40) in wait control register

2 (WCR2) are set as long wait (i.e., are set to 11) (see table 7.4).

Bit 12—Endian Specification for Area 2 (A2ENDIAN): In big-endian format, the MSB of byte

data is the lowest byte address and byte data goes in order toward the LSB

. For little-endian

format, the LSB of byte data is the lowest byte address and byte data goes in order toward the

MSB

. When this bit is 1, the data is rearranged into little-endian format before transfer when the

CS2 space is read or written to. It is used when handling data with little-endian processors or

running programs written with conscious use of little-endian format.

Bit 12: A2ENDIAN

Description

Big-endian

(Initial value)

Little-endian

SH7616 Datasheet(PDF) 283 Page - Renesas Technology Corp

SH7616 Datasheet(HTML) 283 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