BSCS200A_000020020300
Rev. 1.00, 09/03, page 91 of 704
Section 6 Bus Controller (BSC)
This LSI has an on-chip bus controller (BSC) that manages the bus width and the number of
access states of the external address space.
6.1 Features
•
Extended modes
Two modes for external extension
Normal extended mode: Normal extension (when the ADMXE bit in BCR is 0)
Address-data multiplex extended mode: Multiplex extension (when the ADMXE bit in BCR is
1)
•
Extended area division
The external address space is divided into a basic area, and three 64-kbyte areas
The basic area and area 1 are for common settings. Area 2 and 3 bus specifications can be set
independently
Areas 1, 2, and 3 enable chip-select (
CS1
to
CS3
) output
A maximum of 16 addresses can be output
•
Area select signal, address strobe/hold signal polarity control
•
It is possible to reverse the output polarity of
CS1
to
CS3
and
AS
/
AH
by the PNCCS bit in
BCRAn or the PNCASH bit in BCR
Normal Extension:
Address output pins (A15 to A0) and data input/output pins (D15 to D0) are separate
•
Usable areas
Basic area and areas 1, 2, and 3 are all usable
•
Normal extended bus interface
Selection between 2-state access area and 3-state access area is possible
Program wait state insert is possible
•
Idle cycle insertion
Idle cycle insert is possible during the external write cycle, directly after external read cycle.
Содержание H8S/2437
Страница 2: ...Rev 1 00 09 03 page ii of xxxviii ...
Страница 8: ...Rev 1 00 09 03 page viii of xxxviii ...
Страница 32: ...Rev 1 00 09 03 page xxxii of xxxviii ...
Страница 38: ...Rev 1 00 09 03 page xxxviii of xxxviii ...
Страница 168: ...Rev 1 00 09 03 page 130 of 704 ...
Страница 336: ...Rev 1 00 09 03 page 298 of 704 ...
Страница 402: ...Rev 1 00 09 03 page 364 of 704 ...
Страница 454: ...Rev 1 00 09 03 page 416 of 704 ...
Страница 512: ...Rev 1 00 09 03 page 474 of 704 ...
Страница 562: ...Rev 1 00 09 03 page 524 of 704 ...
Страница 648: ...Rev 1 00 09 03 page 610 of 704 ...
Страница 672: ...Rev 1 00 09 03 page 634 of 704 ...
Страница 732: ...Rev 1 00 09 03 page 694 of 704 ...
Страница 742: ...Rev 1 00 09 03 page 704 of 704 ...
Страница 745: ......
Страница 746: ...H8S 2437 Group Hardware Manual REJ09B0059 0100Z ...