Ram Buffer Address Register (Rbufar) - Renesas H8S Series Hardware Manual

Section 18 LPC Interface (LPC)

18.3.14 RAM Buffer Address Register (RBUFAR)

RBUFAR stores the start address of 256-byte buffer in the on-chip RAM used for the flash
memory programming in an LPC/FW memory cycle. The flash memory is programmed in units of
128 bytes. The 128-byte data is stored in the area whose lower address ranges from H'00 to H'7F.
Bits 23 to 16 of the RAM buffer start address are fixed H'FF and bits 7 to 0 are fixed H'00. In the
case of the initial value, the area to be used as a RAM buffer is from H'FFEF00 to H'FFEFFF (256
bytes). The contents of this register must not be changed in an LPC/FW memory cycle (the LMCE
bit is set to 1).
Bit Bit Name Initial Value Slave Host Description
7 RBA15 1
6 RBA14 1
5 RBA13 1
4 RBA12 0
3 RBA11 1
2 RBA10 1
1 RBA9 1
0 RBA8 1
Note: The value must be selected so that the program area for flash memory
*
programming/erasure is not overlapped.
Rev. 3.00 Jul. 14, 2005 Page 654 of 986
REJ09B0098-0300
R/W
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R/W RAM Buffer Addresses 15 to 8
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R/W Though H'D0 to H'EF can be set, setting only H'D1 to
H'EF is valid. Setting other than these values is
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invalid. When setting is invalid, the previous value is
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retained.
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