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ST92195B5 Datasheet(PDF) 10 Page - STMicroelectronics |
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ST92195B5 Datasheet(HTML) 10 Page - STMicroelectronics |
10 / 22 page 10/22 ST92195B - GENERAL DESCRIPTION 1.2.2 I/O Port Styles Legend: AF= Alternate Function, BID = Bidirectional, OD = Open Drain PP = Push-Pull, TTL = TTL Standard Input Levels How to Read this Table To configure the I/O ports, use the information in this table and the Port Bit Configuration Table in the I/O Ports Chapter of the datasheet. Port Style= the hardware characteristics fixed for each port line. Inputs: – If port style = Standard I/O, either TTL or CMOS input level can be selected by software. – If port style = Schmitt trigger, selecting CMOS or TTL input by software has no effect, the input will always be Schmitt Trigger. Weak Pull-Up = This column indicates if a weak pull-up is present or not. – If WPU = yes, then the WPU can be enabled/dis- able by software – If WPU = no, then enabling the WPU by software has no effect Alternate Functions (AF) = More than one AF cannot be assigned to an external pin at the same time: An alternate function can be selected as follows. AF Inputs: – AF is selected implicitly by enabling the corre- sponding peripheral. Exception to this are ADC analog inputs which must be explicitly selected as AF by software. P4.5 All ports useable for general pur- pose I/O (input, output or bidi- rectional) 45 47 PWM5 O PWM Output 5 P4.6 46 48 PWM6 O PWM Output 6 P4.7 47 49 EXTRG I A/D Converter External Trigger Input PWM7 O PWM Output 7 STOUT O Standard Timer Output P5.0 14 20 INT2 I External Interrupt 2 SCK O SPI Serial Clock P5.1 13 19 SDO O SPI Serial Data Out SDI I SPI Serial Data In Port Name General Purpose I/O Pin No. Alternate Functions TQFP64 SDIP56 Pins Weak Pull-Up Port Style Reset Values P0[7:0] no Standard I/O BID / OD / TTL P2[5,4,3,2] no Standard I/O BID / OD / TTL P2[1,0] no Schmitt trigger BID / OD / TTL P3.7 yes Standard I/O AF / PP / TTL P3[6,5,4] no Standard I/O BID / OD / TTL P4[7:0] no Standard I/O BID / OD / TTL P5[1:0] no Standard I/O BID / OD / TTL |
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