AT80C51RD2-RLTIL datasheet(10/83 Pages) ATMEL

Part #	AT80C51RD2-RLTIL

Description	80C51 High Performance ROM 8-bit Microcontroller

Download	83 Pages

Scroll/Zoom	100%

Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

Logo

10 / 83 page

11

AT80C51RD2/AT83C51Rx2

4113B–8051–03/05

Figure 3. Mode Switching Waveforms

The X2 bit in the CKCON0 register (see Table 5) allows to switch from 12 clock periods

per instruction to 6 clock periods and vice versa. At reset, the speed is set according to

X2 bit of Hardware Config Byte (HCB). By default, Standard mode is activated. Setting

the X2 bit activates the X2 feature (X2 mode).

The T0X2, T1X2, T2X2, UARTX2, PCAX2 and WDX2 bits in the CKCON0 register

(Table 5) allow to switch from standard peripheral speed (12 clock periods per periph-

eral clock cycle) to fast peripheral speed (6 clock periods per peripheral clock cycle).

These bits are active only in X2 mode.

XTAL1:2

CPU Block

X2 Bit

X2 Mode

STD Mode

FOSC

XTAL1

Similar Part No. - AT80C51RD2-RLTIL

Manufacturer	Part #	Datasheet	Description
ATMEL Corporation	AT80C51RD2-RLTIL	927Kb / 86P	80C51 High Performance ROM 8-bit Microcontroller

Manufacturer	Part #	Datasheet	Description
ATMEL Corporation	AT80C51RD2	1Mb / 81P	80C51 High Performance ROM 8-bit Microcontroller
	AT80C51RD2	927Kb / 86P	80C51 High Performance ROM 8-bit Microcontroller
	AT83C51RC2	1Mb / 81P	80C51 High Performance ROM 8-bit Microcontroller
NXP Semiconductors	P87C552SFAA	341Kb / 74P	80C51 8-bit microcontroller 2003 Apr 01
Microchip Technology	PIC17LC42AT-08I-PT	1Mb / 241P	High-Performance 8-Bit CMOS EPROM/ROM Microcontroller 01/18/02
	PIC17C4X	1Mb / 240P	High-Performance 8-Bit CMOS EPROM/ROM Microcontroller 1996 - 1999
	PIC17C44	935Kb / 241P	High-Performance 8-Bit CMOS EPROM/ROM Microcontroller 01/18/02
NXP Semiconductors	P87CL52X2	301Kb / 47P	80C51 8-bit microcontroller family 2003 May 14
	P83C660X2	574Kb / 102P	80C51 8-bit microcontroller family 2003 Oct 02
	P89C51RB2HXX	314Kb / 56P	80C51 8-bit Flash microcontroller family 2002 May 24