MITSUBISHI MICROCOMPUTERS
7477/7478 GROUP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
• Interrupt Vector Area
MEMORY
The interrupt vector area is for storing jump destination ad-
dresses used at reset or when an interrupt is generated.
• Zero Page
• Special Function Register (SFR) Area
The special function register (SFR) area contains the registers
relating to functions such as I/O ports and timers.
• RAM
Zero page addressing mode is useful because it enables access
to this area with fewer instruction cycles.
RAM is used for data storage as well as a stack area.
• ROM
• Special Page
Special page addressing mode is useful because it enables ac-
cess to this area with fewer instruction cycles.
ROM is used for storing user programs as well as the interrupt
vector area.
000016
RAM (192 bytes)
for
M37477M4
M37477M8/E8
M37478M4
M37478M8/E8
Zero
page
00BF16
SFR area
00FF16
010016
RAM (192 bytes)
for
M37477M8/E8
M37478M8/E8
01BF16
Not used
C00016
E00016
ROM (16K bytes)
for
M37477M8/E8
M37478M8/E8
M37478M4
ROM (8K bytes)
for
M37477M4
FF0016
Special
page
FFE816
FFFF16
Interrupt vector area
Fig. 2 Memory map
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MITSUBISHI [ Mitsubishi Group ]
