AT89C51CC03C-RLTIM View Datasheet(PDF) - Atmel Corporation

Part Name

Description

MFG CO.

AT89C51CC03C-RLTIM

Enhanced 8-bit MCU with CAN Controller and Flash Memory

Atmel Corporation 

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 module’s capture registers.

To activate this mode the TOG, MAT, and ECOM bits in the module’s CCAPMn SFR

must be set.

Figure 71. PCA High Speed Output Mode

Write to

CCAPnH Reset

CF CR

Write to

CCAPnL

“0” “1”

CCAPnH

CCAPnL

Enable

16-bit comparator

CCON

CCF4 CCF3 CCF2 CCF1 CCF0 0xD8

PCA IT

Match

CH

CL

CEXn

PCA counter/timer

CCAPMn, n = 0 to 4

ECOMn CAPPn CAPNn MATn TOGn PWMn ECCFn

0xDA to 0xDE

Pulse Width Modulator

Mode

All the PCA modules can be used as PWM outputs. The output frequency depends on

the source for the PCA timer. All the modules will have the same output frequency

because they all share the PCA timer. The duty cycle of each module is independently

variable using the module’s capture register CCAPLn. When the value of the PCA CL

SFR is less than the value in the module’s CCAPLn SFR the output will be low, when it

is equal to or greater than it, the output will be high. When CL overflows from FF to 00,

CCAPLn is reloaded with the value in CCAPHn. the allows the PWM to be updated with-

out glitches. The PWM and ECOM bits in the module’s CCAPMn register must be set to

enable the PWM mode.

146 AT89C51CC03

4182K–CAN–05/06

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