ST6365 查看數據表（PDF） - STMicroelectronics

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ST6365

8-BIT MCUs WITH ON-SCREEN-DISPLAY FOR TV TUNING

STMicroelectronics 

ST6365, ST6375, ST6385 ST6367, ST6377, ST6387

1.3 MEMORY SPACES

The MCU operates in three different memory

spaces: Stack Space, Program Space and Data

Space.

1.3.1 Stack Space

The stack space consists of six 12 bit registers that

are used for stacking subroutine and interrupt re-

turn addresses plus the current program counter

register.

1.3.2 Program Space

The program space is physically implemented in

the ROM and includes all the instructions that are

to be executed, as well as the data required for the

immediate addressing mode instructions, the re-

served test area and the user vectors. It is ad-

dressed thanks to the 12-bit Program Counter reg-

ister (PC register) and the ST6 Core can directly

address up to 4K bytes of Program Space. Never-

theless, the Program Space can be extended by

the addition of 2Kbyte memory banks as it is

shown in Figure 4, in which the 20K bytes memory

is described. These banks are addressed by point-

ing to the 000h-7FFh locations of the Program

Space thanks to the Program Counter, and by writ-

ing the appropriate code in the Program ROM

Page Register (PRPR) located at address CAh in

the Data Space. Because interrupts and common

subroutines should be available all the time only

the lower 2K byte of the 4K program space are

bank switched while the upper 2K byte can be

Figure 5. Memory Addressing Diagram

seen as static space. Table 3 gives the different

codes that allows the selection of the correspond-

ing banks. Note that, from the memory point of

view, the Page 1 and the Static Page represent

the same physical memory: it is only a different

way of addressing the same location. On the

ST6385 and ST6387, a total of 20480 bytes of

ROM have been implemented; 20140 bytes are

available as User ROM while 340 bytes are re-

served for testing.

Figure 4. 20K-Byte Program Space Addressing

Program

counter

space

0000h

4FFFh

0FFFh

Page 1

0800h

07FFh

Static

Page

Page 0 Page 1

...

Static Page

0000h

Page 9

STACK SPACE

PROGRAM SPACE

DATA SPACE

PROGRAM COUNTER

0000h

STACK LEVEL 1

STACK LEVEL 2

STACK LEVEL 3

STACK LEVEL 4

STACK LEVEL 5

STACK LEVEL 6

07FFh

0800h

ROM

ROM

0FF0h

INTERRUPT &

RESET VECTORS

0FFFh

0-63

000h

RAM / EEPROM

BANKING AREA

03Fh

040h

07Fh

080h

081h

082h

083h

084h

0C0h

0FFh

DATA ROM

WINDOW

X REGISTER

Y REGISTER

V REGISTER

W REGISTER

RAM

DATA ROM

WINDOW SELECT

DATA RAM

BANK SELECT

ACCUMULATOR

vr01568

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