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EM6626 Datasheet(PDF) 55 Page - EM Microelectronic - MARIN SA |
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EM6626 Datasheet(HTML) 55 Page - EM Microelectronic - MARIN SA |
55 / 69 page R EM6626 Copyright © 2005, EM Microelectronic-Marin SA 55 www.emmicroelectronic.com 18. Mask Options Most options which in many µControllers are realized as metal mask options are directly user selectable with the option registers, therefore allowing a maximum freedom of choice .See chapter: Option Register Memory Map. The following options can be selected at the time of programming the metal mask ROM, except the LCD Segment allocation which is defined using the interconnect metal2 mask. 18.1 Input / Output Ports 18.1.1 Port A Metal Options 18.1.2 Port A Metal Options Pull-up or no pull-up can be selected for each port A input. A pull-up selection is excluding a pull-down on the same input. Pull-down (default) or no pull-down can be selected for each port A input. A pull-down selection is excluding a pull-up on the same 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. Refer also to chapter 19.2 and 19.4 for the pull values. 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 --> Total value of typ. 102 KOhm at VDD=3.0V 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 --> Total value of typ. 103 KOhm at VDD=3.0 Figure 37. Port A Pull Options Resistor R1 MPAPDweak[n] Weak Pull-down MPAPDstrong[n] Strong Pull-down MPAPUweak[n] Weak Pull-up MPAPUstrong[n] Strong Pull-up Pull-up Control PA[n] Terminal 100 KOhm No Pull-up No Pull-down Pull-down Control OR Input Circuitry Option Name Strong Pull- down W Pull- down R1 Value Typ.100 k No Pull- down 1 2 3 4 MPAPD[3] PA3 input pull-down MPAPD[2] PA2 input pull-down MPAPD[1] PA1 input pull-down MPAPD[0] PA0 input pull-down Option Name Strong Pull-up Weak Pull-up R1 Value typ.100k No Pull-up 1 2 3 4 MPAPU[3] PA3 input pull-up MPAPU[2] PA2 input pull-up MPAPU[1] PA1 input pull-up MPAPU[0] PA0 input pull-up |
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