45181 Parallax Inc, 45181 Datasheet - Page 91
45181
Manufacturer Part Number
45181
Description
SX TECH TOOL KIT NO POWER
Manufacturer
Parallax Inc
Series
SXr
Type
Microcontrollerr
Datasheet
1.45180.pdf
(184 pages)
Specifications of 45181
Contents
SX Book, SX Key, SX Tech Board, Samples, Resonators, Cable and Manual
Product
Microcontroller Basic Stamps
Operating Supply Voltage
5 V
For Use With/related Products
SX MCUs
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
- Current page: 91 of 184
- Download datasheet (2Mb)
The following code snippet demonstrates this:
10.2.4 Schmitt-Trigger
Every I/O pin in port B through port E can be set to normal or Schmitt-Trigger input. This can be
configured by writing to the appropriate Schmitt-Trigger register (ST_B, ST_C, ST_D and ST_E). The
I/O pins are set to normal input mode by default. Schmitt-Trigger mode can be activated for all pins,
regardless of pin direction but really matter only when the associated pin is set to input mode. By
configuring Schmitt-Trigger mode on input pins, the SX chip can be less sensitive to minor noise on the
input pins. , below, details the characteristics of Schmitt-Trigger inputs.
Schmitt-Trigger inputs are conditioned with a large area of hysteresis. The threshold for a logic 0 is 15%
of Vdd and the threshold for a logic 1 is 85% of Vdd. The input pin defaults to an unknown state until
the initial voltage crosses a logic 0 or logic 1 boundary. A voltage must cross above 85% of Vdd to be
interpreted as a logic 1 and must cross below 15% of Vdd to be interpreted as a logic 0. If the voltage
transitions somewhere between the two thresholds, the interpreted logic state remains the same as the
previous state.
; Logic Level Configuration
;
MODE $0D
MOV
MOV
MOV
MODE $0F
MOV
MOV
MOV
!ra,#%0000
!rb,#%11110000 ; Port B bits 4-7 to TTL, bits 0-3 CMOS
!rc,#%00001111 ; Port C bits 4-7 to CMOS, bits 0-3 TTL
!ra,#%1100
!rb,#%10110011 ; Port B bits 2,3,6 to output, all others input
!rc,#%11011110 ; Port C bits 0,5 to output, all others input
Figure 15 - Schmitt Trigger Characteristics
; Set Mode to Logic Level configuration
; Port A bits 0-3 to CMOS
; Set Mode to allow Direction configuration
; Port A bits 0-1 to output, bits 2-3 input
10 SX Special Features and Coding Tips
SX-Key/Blitz Development System Manual 2.0 Parallax, Inc. Page 91
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