SH7672 datasheet(201/1292 Pages) RENESAS

201 / 1292 page

Section 7

Bus State Controller (BSC)

Rev. 1.00 Nov. 14, 2007 Page 175 of 1262

REJ09B0437-0100

Internal Address

Space

Memory to be Connected

Cache

H'80000000 to H'FFFBFFFF Other

On-chip RAM, reserved area*



H'FFFC0000 to H'FFFFFFFF Other

On-chip peripheral modules, reserved area*



Note:

For the on-chip RAM space, access the addresses shown in section 27, On-Chip RAM.

For the on-chip peripheral module space, access the addresses shown in section 28,

List of Registers. Do not access addresses which are not described in these sections.

Otherwise, the correct operation cannot be guaranteed.

7.3.2

Data Bus Width and Pin Function Setting in Each Area

In this LSI, the data bus width of area 0 and the initial data bus width of areas 3 to 6 can be set to

8, or 16 bits through external pins during a power-on reset. The bus width of area 0 cannot be

modified after a power-on reset. The initial data bus width of areas 3 to 6 is set to the same size as

that of area 0, but can be modified to 8, 16, or 32 bits through register settings during program

execution. Note that the selectable data bus widths may be limited depending on the connected

memory type.

After a power-on reset, the LSI starts execution of the program stored in the external memory

allocated in area 0. Since ROM is assumed as the external memory in area 0, minimum pin

functions such as the address bus, data bus,

CS0, and RD are available. The sample access

waveforms shown in this section include other pins such as

BS, RD/WR, and WEn, which are

available after they are selected through the pin function controller. Do not attempt any form of

memory access other than reading of area 0 until the pin function settings have been completed by

the program.

For details on pin function settings, see section 23, Pin Function Controller (PFC).

Table 7.3

Correspondence between External Pin (MD) and Data Bus Width

MD_BW

Data Bus Width

8 bits

16 bits

SH7672 Datasheet(PDF) 201 Page - Renesas Technology Corp

SH7672 Datasheet(HTML) 201 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