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H8S/2225 数据表(PDF) 803 Page - Renesas Technology Corp

部件名 H8S/2225
功能描述  16-Bit Single-Chip Microcomputer H8S Family/H8S/2200 Series
PDF  1071 Pages
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制造商  RENESAS [Renesas Technology Corp]
网页  http://www.renesas.com
标志 RENESAS - Renesas Technology Corp

H8S/2225 数据表(HTML) 803 Page - Renesas Technology Corp

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Section 20 Flash Memory (F-ZTAT Version)
Rev. 5.00 Aug 08, 2006 page 717 of 982
REJ09B0054-0500
The differences between boot mode and user program mode are shown in table 20.1.
Figure 20.3 shows the operation flow for boot mode and figure 20.4 shows that for user program
mode.
Boot mode
On-board programming mode
User
program mode
User mode
Reset state
Programmer
mode
RES = 0
FWE = 1
FWE = 0
*1
Notes: Only make a transition between user mode and user program mode when the CPU is
not accessing the flash memory.
1. RAM emulation possible
2. In the H8S/2258, H8S/2239, H8S/2238B, and H8S/2238R, MD0 = 0, MD1 = 0, MD2 = 0,
P14 = 0, P16 = 0, PF0 = 1.
3. In the H8S/2227 Group, MD0 = 0, MD1 = 0, MD2 = 0, P14 = 0, P16 = 0, PF0 = 1, PF3 = 1.
RES = 0
MD1 = 1,
MD2 = 0,
FWE = 1
RES = 0
RES = 0
MD1 = 1,
MD2 = 1,
FWE = 0*
1
MD1 = 1,
MD2 = 1,
FWE = 1
*2
*3
Figure 20.2 Flash Memory State Transitions
Table 20.1 Differences between Boot Mode and User Program Mode
Boot Mode
User Program Mode
Total erase
Yes
Yes
Block erase
No
Yes
Programming control program*
Program/program-verify
Program/program-verify/erase/
erase-verify/emulation
Note:
* To be provided by the user, in accordance with the recommended algorithm.



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