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H8/3021 Datasheet(PDF) 471 Page - Renesas Technology Corp

Part # H8/3021
Description  16-Bit Single-Chip Microcomputer
PDF  712 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H8/3021 Datasheet(HTML) 471 Page - Renesas Technology Corp

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15. ROM
Rev.2.00 Mar. 22, 2007 Page 447 of 684
REJ09B0352-0200
15.2.2
Mode Transitions
When the mode pins and the FWE pin are set in the reset state and a reset-start is executed, the
microcomputer enters an operating mode as shown in figure 15.2. In user mode, flash memory can
be read but not programmed or erased.
The boot, user program and PROM modes are provided as modes to write and erase the flash
memory.
Boot mode
On-board programming mode
User
program mode
User mode
Reset state
PROM mode
RES = 0
FWE = 0
*1
*5
*1
*2
*3
*4
*4
RES = 0
RES = 0
RES = 0
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. The H8/3022F is placed in PROM mode by means of a dedicated PROM programmer.
3. MD2, MD1, MD0 = (0, 0, 1) (0, 1, 0) (0, 1, 1)
FWE = 1
4. MD2, MD1, MD0 = (1, 0, 1) (1, 1, 0) (1, 1, 1)
FWE = 1
5. MD2, MD1, MD0 = (1, 0, 1) (1, 1, 0) (1, 1, 1)
FWE = 0
Figure 15.2 Flash Memory State Transitions



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