T89C51AC2-RLSI-M datasheet(77/117 Pages) ATMEL

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T89C51AC2-RLSI-M Datasheet(PDF) 77 Page - ATMEL Corporation

Part #	T89C51AC2-RLSI-M

Description	8-bit MCU with 32K bytes Flash, 10 bits A/D and EEPROM

PDF	117 Pages

Scroll/Zoom	100%

Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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77 / 117 page

Draft.A - March 30, 2001

Preview - Confidential

T89C51AC2

15.3. 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 registers (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 66. PCA Capture Mode

CEXn

n = 0, 4

PCA Counter

(8bits)

CCAPnH CCAPnL

CCFn

CCON Reg

PCA

Interrupt

Request

0CAPPnCAPNn000 ECCFn

CCAPMn Register (n = 0, 4)

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