SH7020 Datasheet, PDF (66/509 Pages) Renesas Technology Corp – SuperH™ RISC engine

Section 3 Operating Modes
3.1 Types of Operating Modes and Their Selection
The SH7020 and SH7021 operate in one of four operating modes (modes 0, 1, 2, and 7). Modes 0
and 1 differ in the bus width of memory area 0. The mode is selected by the mode pins (MD2–
MD0) as indicated in table 3.1. Do not change the mode selection while the chip is operating.
Table 3.1 Operating Mode Selection
Pin Settings
Operating Mode MD2 MD1 MD0 Mode Name Bus Width of Area 0
Mode 0*²
0
0
0
MCU mode 0 8 bits
Mode 1*²
0
0
1
MCU mode 1 16 bits
Mode 2
0
1
0
MCU mode 2 On-chip ROM
Mode 7*
1
1
1
PROM mode —
Notes : 1.SH7021 PROM version only
2.Only modes 0 and 1are available in the SH7020 ROMless version.
3.2 Operating Mode Descriptions
3.2.1 Mode 0 (MCU Mode 0)
In mode 0, memory area 0 has an eight-bit bus width. For the memory map, see section 8, Bus
State Controller.
3.2.2 Mode 1 (MCU Mode 1)
In mode 1, memory area 0 has a 16-bit bus width.
3.2.3 Mode 2 (MCU Mode 2)
In mode 2, memory area 0 is assigned to the on-chip ROM.
3.2.4 Mode 7 (PROM Mode)
Mode 7 is a PROM mode. In this mode, the EPROM can be programmed.For details,see section
16, ROM. Do not set to mode 7 unless the product is the SH7021(PROM version).
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