Chapter 2 CPU Basics

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.

3 KB

48 KB

x'00000'

256 bytes

x'00100'

x'00C00'

x'03F00' 256 bytes

x'04000' 128 bytes

x'04080'

64 bytes

x'040C0'

x'10000'

abs 8 addressing access area

Data

Special function registers

Interrupt vector table

Subroutine vector table

Instruction code/ table data

Internal *

RAM space

CS9

Internal * ROM space CS0

192 KB

x'20000'

x'3FFFF'

Reserved

MMOD pin = L

Figure 2-2-1 Single-chip Mode

* Differs depending upon the model. [

Table 2-2-2. Internal ROM/ Internal RAM ]

Model

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

 

 

 

 

 

Table 2-2-2. Internal ROM / Internal RAM

Memory Space

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Panasonic F77G, MN101C77C user manual Single-chip Mode, Internal ROM / Internal RAM