AN1833 Freescale Semiconductor / Motorola, AN1833 Datasheet - Page 25

• Manufacturer Part Number: AN1833
• Description: A Low-Power Wireless Remote Control Transmitter and Receiver
• Manufacturer: Freescale Semiconductor / Motorola

AN1833
MOTOROLA
ENABLE TRANSMITTER
CHAR = 55 (HEX)
SERIAL OUT = 0
SERIAL OUT = 1
Send_preamble
DECREMENT
LENGTH = 3
LENGTH = 0
LENGTH
SEE SHEET 1
Figure 10. Transmitter MCU Flowchart (Sheet 2 of 2)
?
NO
THE SECOND DECODED
COMMAND CONTAINS
Freescale Semiconductor, Inc.
YES
KEYPAD VALUE.
For More Information On This Product,
RETURN FROM
SUBROUTINE
NUMBER OF PREAMBLE
CHARACTERS
TO BE SENT
Go to: www.freescale.com
CHAR = CODE
WAIT 500 s
Send_code
WAIT 5 ms
put_char
Microcontroller Software Overview: Initiate an Access Request
Note:
CHAR = COMMAND
AN1240 contains the put_char routine. It converts the byte in
location char to serial data out on the MCU output pin.
CREATES A LOGIC 1
“FRONT PORCH” OF
500 s
CODE CONTAINS THE FIRST
DECODED KEYPAD VALUE.
RESET CODE, COMMAND,
TRANSMITTER ENABLE
AND FLAG BYTES
SERIAL OUT = 0
OFF
put_char
put_char
Application Note
25