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EM6617 Datasheet(PDF) 49 Page - EM Microelectronic - MARIN SA |
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EM6617 Datasheet(HTML) 49 Page - EM Microelectronic - MARIN SA |
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49 / 65 page 
EM6617 Copyright © 2005, EM Microelectronic-Marin SA 49 www.emmicroelectronic.com 19.1.2 Port B Metal Options Pull-up or no pull-up can be selected for each port B input. The pull-up is only active in Nch. open drain mode. Pull-down or no pull-down can be selected for each port B input. The total pull value (pull-up or pull- down) is a series resistance out of the resistance R1 and the switching transistor. As a switching transistor the user can choose between a high impedance (weak) or a low impedance (strong) switch. Weak , strong or none must be chosen. The default is strong. The default resistor R1 value is 100 KOhm. The user may choose a different value from 150 KOhm down to 0 Ohm. However the value must first be checked and agreed by EM Microelectronic Marin SA To select an option put an X in column 1,2 and 4 and reconfirm the R1 value in column 3. The default value is : Strong pull- down with R1=100 KOhm To select an option put an X in column 1,2 and 4 and reconfirm the R1 value in column 3. The default value is : Strong pull-up with R1=100 KOhm Figure 33. Port B Pull Options Resistor R1 MPBPDweak[n] Weak Pull-down MPBPDstrong[n] Strong Pull-down MPBPUweak[n] Weak Pull-up MPBPUstrong[n] Strong Pull-up Pull-Up Control PB[n] Terminal 100 KOhm Pull-down Control or Block No Pull-up No Pull-down Input Circuitry Option Name Strong Pull- down Weak Pull- down R1 Value Typ.100k No Pull- down 1 2 3 4 MPBPD[3] PB3 input pull-down MPBPD[2] PB2 input pull-down MPBPD[1] PB1 input pull-down MPBPD[0] PB0 input pull-down Option Name Strong Pull-up Weak Pull-up R1 value Typ. 100k NO Pull-up 1 2 3 4 MPBPU[3] PB3 input pull-up MPBPU[2] PB2 input pull-up MPBPU[1] PB1 input pull-up MPBPU[0] PB0 input pull-up |
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