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| 型號： | AN2635 |
| 廠商： | 飛思卡爾半導體(中國)有限公司 |
| 英文描述： | On-Chip FLASH Programming Routines |
| 中文描述： | 片上閃存編程例程 |
| 文件頁數(shù)： | 8/36頁 |
| 文件大小： | 150K |
| 代理商： | AN2635 |
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On-Chip FLASH Programming Routines, Rev. 4
8
Freescale Semiconductor
How to Use the Routines
Example 1: Receiving a Byte Serially
Example 1 shows how to receive a byte serially on PTA0:
GetByte equ $037E ;LB8 GetByte jump address
bclr 0,DDRA0 ;Configure port A bit 0 as an input
jsr GetByte ;Call GetByte routine
bcc FrameError ;If C bit is clear, framing error
; occurred. Take a proper action
NOTE
AfterGetByteiscalled,theprogramwillremaininthisroutineuntilaSTART
bit (0) is detected and a complete character is received.
PutByte
PutByte is a routine that receives a byte on the general-purpose I/O PTA0. The sent value must be loaded
into the accumulator (A) before calling this routine. This routine is also used in the monitor mode.
Therefore, it uses the same non-return-to-zero (NRZ) communication protocol. The communication baud
rates are the same as those described in GetByte.
To use this routine, some hardware setup is required. The general-purpose I/O PTA0 must be pulled up
and configured as an input and the PTA0 data bit must be initialized to 0.
Interrupts are not masked and the COP is not serviced in the PutByte routine. User software should
ensure that interrupts are blocked during character transmission.
Entry Condition
A — Contains data sent from PTA0
PTA0 — This pin must be configured as an input and pulled up in hardware and the PTA0 data bit must
be initialized to 0.
Exit Condition
A and X — are restored with entry values.
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