Chapter 2 CPU Basics

2-6-3 Bank Memory Space

When bank function is used, the memory space, where CPU can access as data, shows as the following hatched part.

„Single Chip Mode

In single chip mode used internal ROM and internal RAM, an expanded bank area (bank 1, 2 and a part of bank 3) is in the memory space of internal ROM. In the expanded bank area, reading out of table data is enable, but rewrite is disable.

256 bytes

16 KB

256 bytes

128bytes

64bytes

48 KB

64KB

64 KB

64KB

00000

abs8 addressing

 

access area

00100

 

Data

00C00

 

03F00

 

Peripheral I/O

 

 

 

04000

Interrupt

 

vector table

04080

 

Subroutine

 

vector table

040C0

 

 

Instruction code

 

table data

10000

 

 

20000

 

 

30000

 

 

 

3FFFF

 

Internal RAM

(3 KB)

I/O space

(Special Function Register)

Internal ROM

(48 KB)

Read / Write

Read

bank 0

bank 1

bank 2

bank 3

Figure 2-6-3 Single Chip Mode

Differs depending upon the model. [ Table 2-2-2. Internal ROM/ Internal RAM ]

Bank Function

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Image 81
Panasonic F77G, MN101C77C user manual Bank Memory Space, „Single Chip Mode