AT89C51CC02CA-RATUM datasheet(117/159 Pages) ATMEL

Part #	AT89C51CC02CA-RATUM

Description	Enhanced 8-bit Microcontroller with CAN Controller and Flash

PDF	159 Pages

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Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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117

AT/T89C51CC02

4126L–CAN–01/08

PCA Interrupt

Figure 47. PCA Interrupt System

PCA Capture Mode

To use one of the PCA modules in capture mode either one or both of the CCAPM bits

CAPN and CAPP for that module must be set. The external CEX input for the module

(on port 1) is sampled for a transition. When a valid transition occurs the PCA hardware

loads the value of the PCA counter registers (CH and CL) into the module’s capture reg-

isters (CCAPnL and CCAPnH). If the CCFn bit for the module in the CCON SFR and the

ECCFn bit in the CCAPMn SFR are set then an interrupt will be generated.

Figure 48. PCA Capture Mode

CCON

0xD8

CCF1

CCF0

Module 1

Module 0

PCA Timer/Counter

To Interrupt

IEN0.6

IEN0.7

ECF

CMOD.0

ECCFn

CCAPMn.0

CEXn

n = 0, 1

PCA Counter

(8-bits)

CCAPnH CCAPnL

CCFn

CCON Reg

PCA

Interrupt

Request

0CAPPnCAPNn000ECCFn

CCAPMn Register (n = 0, 1)

AT89C51CC02CA-RATUM Datasheet(PDF) 117 Page - ATMEL Corporation