HD6417021 Hitachi Semiconductor, HD6417021 Datasheet - Page 431

• Manufacturer Part Number: HD6417021
• Description: SuperH RISC engine
• Manufacturer: Hitachi Semiconductor

The operating mode determines whether the on-chip ROM is valid or not. The operating mode is
selected using mode-setting pins MD0-MD2 as shown in table17.1. If you are using the on-chip
ROM, select mode 2; if you are not, select mode 0 or 1. The on-chip ROM is allocated to address
H'0000000–H'0003FFF (SH7020), H'0000000–H'0007FFF (SH7021) of memory area 0. Memory
area 0 (H'0000000-H'0FFFFFF and H'8000000–H'8FFFFFF) is divided into 16-kbyte (SH7020) or
32-kbyte (SH7021) shadows. No matter which shadow is accessed, the on-chip ROM is accessed.
See section 8, Bus State Controller, for more information on shadows.
420 HITACHI
Note:
SH7021
SH7020
The addresses shown in the figure are the first shadow addresses in the on-chip ROM
space.
H'0003FFC
H'0007FFC
H'0000000
H'0000004
H'0000000
H'0000004
Figure 16.1 Block Diagram of ROM
H'0003FFD
H'0007FFD
H'0000001
H'0000005
H'0000001
H'0000005
Internal data bus (32 bits)
Internal data bus (32 bits)
On-chip ROM
On-chip ROM
H'0003FFE
H'0007FFE
H'0000002
H'0000006
H'0000002
H'0000006
H'0003FFF
H'0007FFF
H'0000003
H'0000007
H'0000003
H'0000007