Memory Access Modes; Figure 3.8-1 Mode Data Structure; Table 3.8-1 Mode Pin Setting - Fujitsu F2MC-8L Series Hardware Manual

3.8

Memory Access Modes

The memory access mode supported by the MB89120/120AMB89120A series is only
single-chip mode.
Single-chip Mode
In single-chip mode, the device uses internal RAM and ROM only. Therefore, the CPU can only
access to internal I/O, RAM and ROM areas.
Mode Pins (MOD0, MOD1)
Mode pins (MOD1 and MOD0) must be set to "V
When a reset occurs, the mode data and reset vector are read from internal ROM.
Do not change the mode pin settings, even after completion of the reset (i.e. during operation).
Table 3.8-1 lists the mode pin settings.

Table 3.8-1 Mode Pin Setting

MOD1
V
V
V
V
Mode Data
Be sure to set the mode data bits in internal ROM to "00
Address
FFFD
Pin state
MOD0
V
SS SS
V
SS CC
V
CC SS
V
CC CC

Figure 3.8-1 Mode Data Structure

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
H
Data
00
Other
, V
SS
Reads the mode data and reset vector from internal ROM.
Prohibited setting
Operation
Selects single-chip mode.
H
Reserved. Do not set this value.
3.8 Memory Access Modes
".
SS
Description
" to select single-chip mode.
H
95