參數(shù)資料
型號(hào)： M37512F8HP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, FLASH, 4 MHz, MICROCONTROLLER, PQFP48
封裝： 7 X 7 MM, 0.50 MM PITCH, PLASTIC, LQFP-48
文件頁(yè)數(shù)： 59/89頁(yè)
文件大?。?/td> 877K
代理商： M37512F8HP
Feb 18, 2005
page 60 of 85
REJ03B0122-0101
7512 Group
Fig. 68 Block diagram of built-in flash memory (M37512FCHP)
(1) CPU Rewrite Mode
In CPU rewrite mode, the internal flash memory can be operated
on (read, program, or erase) under control of the Central Process-
ing Unit (CPU).
In CPU rewrite mode, only the User ROM area shown in Figure 68
can be rewritten; the Boot ROM area cannot be rewritten. Make
sure the program and block erase commands are issued for only
the User ROM area and each block area.
The control program for CPU rewrite mode can be stored in either
User ROM or Boot ROM area. In the CPU rewrite mode, because
the flash memory cannot be read from the CPU, the rewrite con-
trol program must be transferred to internal RAM area to be
executed before it can be executed.
Microcomputer Mode and Boot Mode
The control program for CPU rewrite mode must be written into
the User ROM or Boot ROM area in parallel I/O mode beforehand.
See Figure 68 for details about the Boot ROM area.
Normal microcomputer mode is entered when the microcomputer
is reset with pulling CNVSS pin low. In this case, the CPU starts
operating using the control program in the User ROM area.
When the microcomputer is reset by pulling the P24/SDA2/RXD pin
high, the CNVss pin high, the CPU starts operating using the con-
trol program in the Boot ROM area (program start address is
FFFC16, FFFD16 fixation). This mode is called the “Boot” mode.
Block Address
Block addresses refer to the maximum address of each block.
These addresses are used in the block erase command.
Notes 1: The Boot ROM area can be rewritten in only parallel
input/output mode. (Access to any other areas is inhibited.)
2: To specify a block, use the maximum address in the block.
Data block A : 2K Byte
Block 3 : 16K Byte
Block 2 : 16K Byte
Block 1 : 8K Byte
Block 0 : 8K Byte
FFFF16
E00016
C00016
800016
200016
180016
100016
User ROM area
Data block B : 2K Byte
SFR area
Internal RAM area
(1.5K Byte)
FFFF16
100016
0FFF16
0FE016
063F16
004016
000016
FFFF16
F00016
Boot ROM area
4K Byte
SFR area
Internal flash memory area
(52K Byte)
RAM
Not used
400016
3FFF16
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