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EM6620WS27 データシート(PDF) 29 Page - EM Microelectronic - MARIN SA |
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EM6620WS27 データシート(HTML) 29 Page - EM Microelectronic - MARIN SA |
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29 / 56 page  R EM6620 Copyright © 2005, EM Microelectronic-Marin SA 29 www.emmicroelectronic.com • CPU controlled Start and PA[3] controlled Stop. In this mode setting the bit RunEn=1 while PA3/uP=0 while immediately start the counting action. Afterwards one needs to prepare for the stop by PA[3]. Therefore the PA[3] start condition must first be fulfilled. This is in dT mode a rising edge on the PA3internal signal (PA3internal, refer to Figure 18). In MSC mode the start condition is a positive pulse on PA3internal signal. The creation of this edge or pulse is done per software by manipulating the PA3Edge selection. See Figure 20 for details. Afterwards one can change to PA3 controlled stop mode (PA3/uP=1) where the next positive edge on PA3internal will stop the Counter. In dT mode the RunEn/stop bit will be cleared with the PA3 stop condition where as in MSC mode MSC mode the RunEn is not cleared. • Pulse-width measurement of PA[3] Input Signals. In this mode the bit dT/MSC=1 and PA3/uP=1. Setting RunEn/stop=1 enables the operation. The first positive edge on PA3Internal signal will start the counter, the following negative edge will stop the counter end set bit RunEn/Stop to 0 . PA3internal signal is a copy of the PA[3] terminal status if PA3Edge=1. with PA3Edge=0 PA3Internal has the inverted PA[3] value. See also Figure 18 and Figure 21. • Port A PA[3] controlled Start and Stop Mode. In this mode the bit dT/MSC=0 and PA3/uP=1. Setting RunEn/stop=1 enables the operation. The first positive edge on PA3Internal signal will start the counter , the second edge will stop the counter, the third one will restart, etc, . PA3internal signal is a copy of the PA[3] terminal status if PA3Edge=1. With PA3Edge=0 PA3Internal has the inverted PA[3] value. See also Figure 18 and Figure 21. Figure 20. CPU controlled Start PA[3] controlled Stop C ount i n g Se t I n it ia l V a l ues St o p St a r t PA 3 St a r t µP dT / M S C = 1 , S t op on P A [ 3 ] R i s i ng E dge CP U W r i t e P A 3E dge P A 3/ uP R unE n/ S t op P A 3I nt er nal C ount PA [ 3 ] Se t I n it ia l V a l ues C ount i n g St o p St a r t PA 3 St a r t µP dT / M S C = 1 , S t op on P A [ 3 ] F a l l i ng E dge CP U W r i t e P A 3E dge P A 3/ uP R unE n/ S t op P A 3I nt er nal C ount PA [ 3 ] C ount i n g Se t I n it ia l V a l ues St o p St a r t PA 3 St a r t µP dT / M S C = 0 , S t op on P A [ 3] R i s i ng E dge CP U W r i t e P A 3E dge P A 3/ uP R unE n/ S t op P A 3I nt er nal C ount PA [ 3 ] C ount i n g Se t I n it ia l V a l ues St o p St a r t PA 3 St a r t µP dT / M S C = 0 , S t op on P A [ 3 ] F a l l i ng E dge CP U W r i t e P A 3E dge P A 3/ uP R unE n/ S t op P A 3I nt er nal C ount PA [ 3 ] Figure 21. dT/MSC behavior restart stop start stop start Counter RunEn Counting Counting Counting PA3 internal Period m easurem ent dT/MSC=0, PA3/up=1 Pulse-width Measurem ent dT/MSC, PA3/up=1 Counter RunEn PA3 internal |
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