Section 6 Bus Controller
Rev. 3.00 Jan 25, 2006 page 105 of 872
REJ09B0286-0300
6.2
Input/Output Pins
Table 6.1 summarizes the pins of the bus controller.
Table 6.1
Pin Configuration
Symbol
I/O
Function
AS
Output
Strobe signal indicating that address output on the address
bus is enabled (when the IOSE bit in SYSCR is cleared to 0).
Note that this signal is not output (the 256-kbyte expansion
area is accessed while the CS256E bit in SYSCR is 1) or
when the CP/CF expansion area is accessed (the CPCSE bit
in BCR2 is 1).
IOS
Output
I/O select signal (when the IOSE bit in SYSCR is set to 1).
CPCS1
,
CPCS2
Output
Chip select signal indicating that the CP/CF expansion area is
being accessed (in mode 2 or when the CPCSE bit in BCR2
is set to 1).
CS256
Output
Chip select signal indicating that the 256-kbyte expansion
area is being accessed (in mode 2 or when the CS256E bit in
SYSCR is set to 1).
RD
/
CPOE
Output
Strobe signal indicating that the external address space is
being read.
HWR
/
CPWE
Output
Strobe signal indicating that the external address space is
being written to, and the upper half (D15 to D8) of the data
bus is enabled.
(Note however that the effective data bus must be specified
by the
CPCS1
and
CPCS2
signals when the CP/CF
expansion area is being accessed.)
LWR
Output
Strobe signal indicating that the external address space is
being written to, and the lower half (D7 to D0) of the data bus
is enabled.
WAIT
/
CPWAIT
Input
Wait request signal when accessing the external 3-state
access space or CP/CF expansion area.
Содержание H8S/2158
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Страница 440: ...Section 15 Watchdog Timer WDT Rev 3 00 Jan 25 2006 page 386 of 872 REJ09B0286 0300...
Страница 606: ...Section 17 I 2 C Bus Interface IIC Rev 3 00 Jan 25 2006 page 552 of 872 REJ09B0286 0300...
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Страница 878: ...Section 28 List of Registers Rev 3 00 Jan 25 2006 page 824 of 872 REJ09B0286 0300...
Страница 926: ...Index Rev 3 00 Jan 25 2006 page 872 of 872 REJ09B0286 0300...