HMS91C7134K 데이터 시트보기 (PDF) - Hynix Semiconductor

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HMS91C7134K

8-BIT SINGLE-CHIP MONITOR MICROCONTROLLERS

Hynix Semiconductor 

HMS9xC7132 / HMS9xC7134

contain 128 directly addressable bit locations.The stack depth is

only limited by the available internal RAM space of 256 bytes.

XRAM0

The 256 bytes of XRAM0 used to support DDC interface is also

available for system usage by indirect addressing through the ad-

dress pointer DDCADR and data I/O buffer RAMBUF. The ad-

dress pointer(DDCADR) is equipped with the postincrement

capability to facilitate the transfer of data in bulk (for details refer

to DDC Interface part). However, it is also possible to address the

DRAM through MOVX command as usually used in the internal

RAM extension of 80C51 derivatives. XRAM0 0 to 255 is direct-

ly addressable as external data memory locations 0 to 255 via

MOVX-DPTR instruction or via MOVX-Ri instruction when the

EXCON’s LSB is zero. Since external access function is not

available, any access to XRAM0 0 to 255 will not affect the

ports.

7

6

543

2

10

-

-

-

-

-

-

- XRAMS

Table 8-1 Extended control Register(EXCON)

BYTE

ADDRESS

(HEX)

BIT

ADDRESS

(HE X )

BYTE

ADDRESS

(DECIM AL)

FFH (MSB)

~~

(LSB) 255

~~

2FH 7F 7E 7D 7C 7B 7A 79 78 47

2EH 77 76 75 74 73 72 71 70 46

2DH 6F 6E 6D 6C 6B 6A 69 68 45

2CH 67 66 65 64 63 62 61 60 44

2BH 5F 5E 5D 5C 5B 5A 59 58 43

2AH 57 56 55 54 53 52 51 50 42

29H 4F 4E 4D 4C 4B 4A 49 48 41

28H 47 46 45 44 43 42 41 40 40

27H 3F 3E 3D 3C 3B 3A 39 38 39

26H 37 36 35 34 33 32 31 30 38

25H 2F 2E 2D 2C 2B 2A 29 28 37

24H 27 26 25 24 23 22 21 20 36

23H 1F 1E 1D 1C 1B 1A 19 18 35

22H 17 16 15 14 13 12 11 10 34

21H 0F 0E 0D 0C 0B 0A 09 08 33

20H 07 06 05 04 03 02 01 00 32

1FH

31

BANK3

18H

24

17H

23

10H

BANK2

16

0FH

15

BANK1

08H

8

07H

7

BANK0

00H

0

Figure 8-5 RAM ADDRESS

18

May.2001 ver1.1

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