H8SSLASH2214 datasheet(232/936 Pages) RENESAS

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Section 6 Bus Controller

Rev.4.00 Sep. 18, 2008 Page 172 of 872

REJ09B0189-0400

6.10.8

Notes on Use of External Module Extended Functions

When accessing addresses in the range H'FFFF40 to H'FFFF5F in the LSI’s on-chip ROM valid

extended mode (mode 6), care must be taken with regard to the following.

Figure 6.23 is an address map for the on-chip ROM valid extended mode (mode 6). When bit

P75MSOE in the external module connection output pin register (OPINSEL) is set to 1 and

EXMS

output from pin 75 is enabled, accessing external address [3] (address range: H'FFFF40 to

H'FFFF5F) causes low-level output from

EXMS. This low-level output is maintained thereafter

even if on-chip ROM, on-chip RAM, or the on-chip I/O registers are accessed.

As a countermeasure, output from

EXMS can be driven high by accessing external addresses [1]

and [2]. Consequently, after accessing external address [3], make sure to perform a dummy read of

1 byte to external addresses [1] and [2] to drive output from

EXMS high before accessing on-chip

RAM or the on-chip I/O registers.

EXMS output state

H'000000

Previous value maintained

On-chip ROM

High

External address [1]

H'020000

Previous value maintained

Reserved area

H'FFB000

Previous value maintained

On-chip RAM

H'FFC000

High

External address [2]

H'FFEFC0

Previous value maintained

Internal I/O registers

H'FFF800

Low

External address [3]

H'FFFF40

Previous value maintained

Internal I/O registers

H'FFFF60

Previous value maintained

On-chip RAM

H'FFFFC0

H'FFFFFF

Figure 6.23 On-Chip ROM Valid Extended Mode (Mode 6) Address Map

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