AT89C51RC2-3CSIM datasheet(41/127 Pages) ATMEL

No. de pieza	AT89C51RC2-3CSIM

Descripción Electrónicos	Microcontroller with 16K/32K Bytes Flash

PDF	127 Pages

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Fabricante Electrónico	ATMEL [ATMEL Corporation]

Página de inicio	http://www.atmel.com

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AT89C51RB2/RC2

4180C–8051–12/03

High-speed Output Mode In this mode the CEX output (on port 1) associated with the PCA module will toggle

each time a match occurs between the PCA counter and the modules capture registers.

To activate this mode the TOG, MAT, and ECOM bits in the modules CCAPMn SFR

must be set (see Figure 15).

A prior write must be done to CCAPnL and CCAPnH before writing the ECOMn bit.

Figure 15. PCA High-speed Output Mode

Before enabling ECOM bit, CCAPnL and CCAPnH should be set with a non-zero value,

otherwise an unwanted match could occur.

Once ECOM is set, writing CCAPnL will clear ECOM so that an unwanted match doesn’t

occur while modifying the compare value. Writing to CCAPnH will set ECOM. For this

reason, user software should write CCAPnL first, and then CCAPnH. Of course, the

ECOM bit can still be controlled by accessing to CCAPMn register.

CCAPnH

CCAPnL

ECOMn

CCAPMn, n = 0 to 4

0xDA to 0xDE

CAPNn MATn TOGn PWMn ECCFn

CAPPn

16-bit Comparator

Match

CCON

0xD8

CCF4 CCF3

CCF2

CCF1

CCF0

PCA IT

Enable

CEXn

PCA Counter/Timer

Write to

CCAPnH

Reset

Write to

CCAPnL

AT89C51RC2-3CSIM Datasheet(PDF) 41 Page - ATMEL Corporation