STC89C53RC datasheet(24/165 Pages) STC

No de pièce	STC89C53RC

Description	Enhanced 80C51 Central Processing Unit ,6T or 12T per machine cycle

PDF	165 Pages

Scroll/Zoom	100%

Fabricant	STC [STCmicro Technology Co,.Ltd]

Site Internet	http://www.stcmicro.com/

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AUXR register

bit

name

EXTRAM ALEOFF

B7 ~ B3 : resevered.

EXTRAM : Internal/External RAM access

: For RD+ series, on-chip auxiliary RAM is enabled and located at the address 0x0000 to 0x03FF. And if

address over 0x03FF, off-chip external RAM becomes the target automatically.

For RC seires, on-chip auxiliary RAM is enabled and located at the address 00H to FFH. And if address

over FFH, off-chip external RAM becomes the target automatically.

: On-chip auxiliary RAM is always disabled.

ALEOFF : Disable/Enable ALE

: ALE is emitted at a constant rate of 1/3 the system clock in 6T mode, 1/6 SYSclk in 12T mode.

: ALE is active only during a MOVX or MOVC instruction.

AUXR1 register

bit

name

GF2

DPS

GF2 : General purpose user-defined Flag. It can be used by software.

DPS : DPTR registers select bit.

0 : DPTR0 is selected(Default).

1 : The secondary DPTR(DPTR 1) is switched to use.

External

RAM 63KB

Auxiliary RAM 1KB

0x0000

0x03FF

0x0400

0xFFFF

External

RAM 64KB

FFFFH

EXTRAM=0

EXTRAM=1

0000H

STC89C53RC Fiches technique(PDF) 24 Page - STCmicro Technology Co,.Ltd