SH7050 Datasheet, PDF (132/841 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperH RISC engine Family/

Section 8 Bus State Controller (BSC)
Table 8.2 Register Configuration
Name
Abbr. R/W Initial Value Address
Access Size
Bus control register 1
BCR1 R/W H'000F
H'FFFF8620 8, 16, 32
Bus control register 2
BCR2 R/W H'FFFF
H'FFFF8622 8, 16, 32
Wait state control register 1 WCR1 R/W H'FFFF
H'FFFF8624 8, 16, 32
Wait state control register 2 WCR2 R/W H'000F
H'FFFF8626 8, 16, 32
RAM emulation register
RAMER R/W H'0000
H'FFFF8628 8, 16, 32
Notes: 1. When using a longword access to write to RAMER , always write 0 in the lower word
(address H'FFFF8630). Operation cannot be guaranteed if a non-zero value is written.
2. In register access, three cycles are required for byte access and word access, and six
cycles for longword access.
8.1.5 Address Map
Figure 8.2 shows the address format used by the SH7050 series.
A31–A24
A23, A22 A21
A0
Output address:
Output from the address pins
CS space selection:
Decoded, outputs CS0 to CS3 when A31 to A24 = 00000000
Space selection:
Not output externally; used to select the type of space
On-chip ROM space or CS0 to CS3 space when 00000000 (H'00)
DRAM space when 00000001 (H'01)
Reserved (do not access) when 00000010 to 11111110 (H'01 to H'FE)
On-chip peripheral module space or on-chip RAM space when 11111111 (H'FF)
Figure 8.2 Address Format
This LSI uses 32-bit addresses:
• A31 to A24 are used to select the type of space and are not output externally.
• Bits A23 and A22 are decoded and output as chip select signals (CS0 to CS3) for the
corresponding areas when bits A31 to A24 are 00000000.
• A21 to A0 are output externally.
Rev. 5.00 Jan 06, 2006 page 112 of 818
REJ09B0273-0500