Datasheet 搜索 > 微控制器 > NXP（恩智浦） > MCHC908JW32FC 数据手册 > MCHC908JW32FC 用户编程技术手册 3/28 页
器件3D模型￥ 61.678
MCHC908JW32FC 用户编程技术手册 - NXP（恩智浦）
制造商:
NXP（恩智浦）
分类:
微控制器
封装:
QFN-48
Pictures:
3D模型
符号图
焊盘图
引脚图
产品图
页面导航:
技术参数、封装参数在P14
应用领域在P1
导航目录
MCHC908JW32FC数据手册
Page:
of 28 Go
若手册格式错乱，请下载阅览PDF原文件
AN2398/D
OVERVIEW AND MEMORY USAGE
In-Circuit Programming of FLASH Memory via the USB for the MC68HC908JB8 3
Vector Redirecting Since the ICP scheme erases and reprograms the user code only, mass erase
operation cannot be used. This means the user code is erased using multiple
block erase operations. And because mass erase is not used, the user FLASH
vectors cannot be erased during ICP (a fail-save mechanism allows only mass
erase operation to erase the user FLASH vectors).
Since the user FLASH vectors are now fixed, these must be re-directed to the
proper addresses for the interrupt service subroutines in the user code. This is
achieved using “pseudo” vectors, which are 3-byte vectors containing a JMP
instruction and the absolute address to the actual interrupt service subroutines
in the user program. Figure 2 shows how the vectors are re-directed. The only
vector that is not re-directed is the reset vector. The reset vector always points
to $F800 — the start of the ICP code.
Figure 2. Vector Redirecting
Table 1 lists interrupt vector addresses and the pseudo vector addresses for
redirecting.
ICP Code
User Code
Vectors redirection
(KBI vector low byte) $FFF1
(KBI vector high byte) $FFF0
$FBFF
$DC00
$F800
$F7FF
ICP_FLAG
$00
$F8
(Reset vector low byte) $FFFF
(Reset vector high byte) $FFFE
$yy
$xx
$CC (JMP instruction)
:
Reset vector
$bb
$aa
$xxyy
KBI
Service Routine
$aabb
:
KBI vector
Redirected
KBI vector
$F7FE
Freescale Semiconductor, I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
nc
.
..
器件 Datasheet 文档搜索
AiEMA 数据库涵盖高达 72,405,303 个元件的数据手册，每天更新 5,000 多个 PDF 文件
