Processor Modes - Renesas 7700 FAMILY User Manual

CENTRAL PROCESSING UNIT (CPU)

2.5 Processor modes

2.5 Processor modes
The M37751 can operate in 3 processor modes: single-chip mode, memory expansion mode, and microprocessor
mode. Some pins' functions, memory assignment, and access space vary according to the processor modes.
This section describes the differences between the processor modes. Figure 2.5.1 shows a memory assignment
in each processor mode.
Single-chip mode
000000
16
SFR area
000080
16
Internal
RAM area
00087F
16
Not used
004000
16
Internal
ROM area
00FFFF
16
: External area; Accessing this area make it possible to access external connected devices.
Notes 1: Addresses 2
2: Refer to "Appendix 1. Memory assignment" for products other than M37751M6C–XXXFP.
Fig. 2.5.1 Memory assignment in each processor mode for M37751M6C-XXXFP
2–22
Memory expansion mode
SFR area
Internal
RAM area
000880
16
003FFF
16
Internal
ROM area
010000
16
FFFFFF
16
to 9 become a external area in the memory expansion mode and microprocessor mode.
16 16
7751 Group User's Manual
Memory expansion mode
Microprocessor mode
Microprocessor mode
SFR area
Internal
RAM area
000002
16
(Note 1)
000009
16