HD64F2149 Datasheet, PDF (710/1035 Pages) Renesas Technology Corp – Hitachi 16-Bit Single-Chip Microcomputer

H'(FF)E080
H'(FF)E088
ID code area
Programming
control program
area*¹
(2040 bytes)
H'(FF)E880
H'(FF)EFFF
Boot program
area*²
(1920 bytes)
H'(FF)FF00
H'(FF)FF7F
Boot program
area*²
(128 bytes)
Note: *1 This reserved area is used only for boot mode operation. Do not use this area for other
purpose.
*2 The boot program area cannot be used until a transition is made to the execution state
for the programming control program transferred to the reserved area. Note that the boot
program remains stored in this area after a branch is made to the programming control
program.
Figure 22.10 RAM Areas in Boot Mode
In boot mode in the chip, the contents of the 8-byte ID code area shown below are checked to
determine whether the program is a programming control program compatible with the chip.
H'(FF)E080
H'(FF)E088 ~
40 FE 64 66 32 31 34 39
↑ (Product ID code)
Programming control program instruction codes
If an original programming control program is used in boot mode, the 8-byte ID code shown
above should be added at the beginning of the program.
Notes on Use of Boot Mode:
• When the chip comes out of reset in boot mode, it measures the low period of the input at the
SCI’s RxD1 pin. The reset should end with RxD1 high. After the reset ends, it takes about 100
states for the chip to get ready to measure the low period of the RxD1 input.
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