Datasheet > AN2635

AN2635

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
飞思卡尔 - FREESCALE		闪存
页数	文件大小	规格书
36页	149K
描述
On-Chip FLASH Programming Routines

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AN2635 数据手册

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

bclr 0,DDRA0

;LB8 GetByte jump address

;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

After GetByte is called, the program will remain in this routine until a START

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.

On-Chip FLASH Programming Routines, Rev. 4

Freescale Semiconductor

1...5 6 789 10 11...36

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