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Chapter 2 CPU Basics
Memory Space
Figure 2-2-1 Single-chip Mode
2-2-2 Single-chip Mode
In single-chip mode, the system consists of only internal memory. This is the optimized memory mode and
allows construction of systems with the highest performance.
The single-chip mode uses only internal ROM and internal RAM. The MN101C series devices offer up to 12
KB of RAM and up to 240 KB of ROM. This LSI offers 3 KB of RAM and 48 KB of ROM.
MMOD pin = L
Internal
RAM space
Special function registers
x'00000'
x'00100'
3 KB
256 bytes
256 bytes
128 bytes
64 bytes
48 KB
x'03F00'
x'00C00'
x'04000'
x'04080'
x'040C0'
Internal
ROM space
*
*
abs 8 addressing
access area
Data
Interrupt
vector table
Subroutine
vector table
Instruction code/
table data
x'3FFFF'
192 KB
Reserved
CS0
CS9
x'20000'
x'10000'
* Differs depending upon the model. [ Table 2-2-2. Internal ROM/ Internal RAM ]
Table 2-2-2. Internal ROM / Internal RAM
Address bytes Address bytes
MN101C77C X'04000' to X'0FFFF' 48 K X'00000' to X'00BFF' 3 K
MN101CF77G X'04000' to X'23FFF' 128 K X'00000' to X'017FF' 6 K
Internal ROM Internal RAM
Model