Memory Access Mode; Single-Chip Mode; Mode Data; Operations For Selecting Memory Access Mode - Fujitsu F2MC-8L F202RA Hardware Manual

CHAPTER 3 CPU
3.8

Memory Access Mode

The MB89202/F202RA series supports only single-chip mode for access to memory.
■

Single-chip Mode

In single-chip mode, only internal RAM and ROM are used. The CPU can access only the internal I/O area,
RAM area, and ROM area.
■

Mode Data

Set 00
H
Address
bit7
FFFD
H
■

Operations for Selecting Memory Access Mode

Only single-chip mode is selectable.
Table 3.8-1 provides the settings for the mode pins and mode data.
Table 3.8-1 Settings for Mode Data
Memory access mode
Single-chip mode
Figure 3.8-2 shows the operations for selecting memory access.
72
into the mode data in internal ROM to select single-chip mode.
Figure 3.8-1 Configuration of Mode Data
bit6 bit5 bit4
Other modes
bit3 bit2 bit1 bit0
Value
00
Selects single-chip mode.
H
Other than 00
Reserved. Do not specify this value.
H
Mode data
00
H
Prohibited
Operation