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

CPUSPD

To set up proper delays used in the PRGRNGE and ERARNGE routines, a value indicating the internal

operating frequency (f ) must be stored at CPUSPD, which is located at RAM address RAM+$9. In the

case of the MC68HC908LB8, the CPUSPD is located at $89. The CPUSPD value is the nearest integer

of f (in MHz) times 4. For example, if f is 4.2 MHz, the CPUSPD value is 17. If f is 2.1 MHz, the

CPUSPD value is 8. Setting a correct CPUSPD value is very important to program or erase the FLASH

successfully.

LADDR

A range specifies the FLASH locations to be read, verified, or programmed. The 16-bit value in RAM

addresses RAM+$A and RAM+$B holds the last address of a range. The addresses RAM+$A and

RAM+$B are the high and low bytes of the last address, respectively. In the case of MC68HC908LB8, the

LADDR is located at $8A and $8B. LADDR is used for RDVRRNG and PRGRNGE routines.

DATA

DATA is the first location of the DATA array and is located at RAM address RAM+$C. For the

MC68HC908LB8, the DATA is located at $8C. The array is used for loading program or verify data. The

DATA array must be in the zero page and its size must match the size of the range to be programmed or

verified.

Registers H:X

In the RDVRRNG and PRGRNGE routines, registers H and X are initialized with a 16-bit value

representing the first address of a range. High and low bytes of the address are stored to registers H and

X, respectively. In the ERARNGE routine, registers H and X are initialized with an address which is within

the page or entire array to be erased.

How to Use the Routines

This section describes the details of each routine. Table 2 provides necessary addresses used in the

on-chip FLASH routines for each MCU type. Table 3 summarizes the six routines.

Table 2. MCU Type vs. Necessary Addresses Required for On-Chip FLASH Routines

MCU Name

MC68HC908LB8

MC68HC908QL4

MC68HC908QY4A

RAM

$80

GetByte

$037E

$2B7E

$2800

PutByte

$0381

RDVRRNG PRGRNGE ERARNGE DELNUS

$0384

$2B84

$2803

$038A

$2B8A

$2809

$0387

$2B87

$2806

$038D

$2B8D

$280C

$2B81

$280F

(1)

Series

MC68HC908QB4/QB8,

MC68HC908QY8

$80

$2800

$280F

$2803

$2809

$2806

$280C

NOTES:

1. MC68HC908QY4A Series includes MC68HC908QY4A, MC68HC908QY2A, MC68HC908QY1A, MC68HC908QT4A,

MC68HC908QT2A, MC68HC908QT1A

On-Chip FLASH Programming Routines, Rev. 4

Freescale Semiconductor

1 2 345 6 7...36

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