Rev. 1.0, 09/01, page 12 of 904
Type Symbol
Pin
No.
I/O
Function
Bus control
RA S
/
R A S
2
RA S3
to
RA S5
109, 110,
35, 36
Output Row address strobe signal for the synchronous
DRAM interface.
RA S
signal is a row address strobe signal when
areas 2 to 5 are set to the continuous DRAM space.
RA S
109
Output Row address strobe signal for the synchronous
DRAM of the synchronous DRAM interface.
CA S
110
Output Column address strobe signal for the synchronous
DRAM of the synchronous DRAM interface.
W E
35
Output Write enable signal for the synchronous DRAM of
the synchronous DRAM interface.
W A IT
84
Input
Requests insertion of a wait state in the bus cycle
when accessing external 3-state address space.
O E
(
O E
)
38,
137
Output Output enable signal for DRAM interface space.
The output pins of
O E
and (
O E
) are selected by the
port function control register 2 (PFCR2) of port 3.
CKE
(CKE)
38,
137
Output Clock enable signal of the synchronous DRAM
interface space.
The output pins of CKE and (
CK E
) are selected by
the port function control register 2 (PFCR2) of port
3.
Interrupt
signals
NMI
40
Input
Nonmaskable interrupt request pin.
Fix high when
not used.
IRQ 15
to
IRQ 0
86, 85,
106 to 104,
83 to 81,
31 to 28,
136 to 133
(
IRQ 15
)
to (
IRQ 0
)
58 to 51,
38, 37,
61 to 59,
34, 33, 3
Input
These pins request a maskable interrupt.
The input pins of
IRQ n
and (
IRQ n
) are selected by
the IRQ pin select register (ITSR) of the interrupt
controller. (n = 0 to 15)
DMA controller
(DMAC)
D REQ 1
D REQ 0
82,
81
Input
These signals request DMAC activation.
TEN D 1
TEN D 0
104,
83
Output These signals indicate the end of DMAC data
transfer.
D A CK 1
D A CK 0
106,
105
Output DMAC single address transfer acknowledge signals.
EXDMA
controller
(EXDMAC)
ED REQ 3
,
ED REQ 2
33,
3
Input
These signals request EXDMAC activation.
Содержание H8S/2376 F-ZTAT
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