參數(shù)資料
型號： 7643
英文描述： IrDA. protocol handler plus endec for DCE Apps, -40C to +85C, 18-SOIC 300mil, TUBE
中文描述： 7643Group數(shù)據(jù)表數(shù)據(jù)表1369K/JUL.30.03
文件頁數(shù)： 87/120頁
文件大?。?/td> 1369K
代理商： 7643
Rev.1.00 Jul 30, 2003 page 87 of 119
7643 Group
Fig. 78 Block diagram of built-in flash memory
(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 78
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.
(If the control program is written into the Boot ROM area, the stan-
dard serial I/O mode becomes unusable.)
See Figure 78 for details about the Boot ROM area.
Normal microcomputer mode is entered when the microcomputer
is reset with pulling CNV
SS
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 P3
6
(CE) pin high,
the P8
1 (SCLK)
pin high, the CNV
SS
pin high, the CPU starts oper-
ating using the control program in the Boot ROM area. 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.
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