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38
Table 1.7
Pin Functions (cont)
Classification
Symbol
I/O
Name
Function
Operating
mode control
MD0–MD3
I
Mode set
Determines the operating mode. Do
not change input value during
operation.
FWP
I
Flash memory
write protect
Protects flash memory from being
written or deleted.
Interrupts
NMI
I
Non-maskable
interrupt
Non-maskable interrupt request pin.
Enables selection of whether to
accept on the rising or falling edge.
IRQ0
–
IRQ7
I
Interrupt
requests 0–7
Maskable interrupt request pins.
Allows selection of level input and
edge input.
IRQOUT
O
Interrupt request
output
Indicates that interrupt cause has
occurred. Enables notification of
interrupt generation also during bus
release.
Address bus
A0–A21
O
Address bus
Outputs addresses.
Data bus
D0–D15
(QFP-112)
D0–D31
(QFP-144)
I/O
Data bus
16-bit (QFP-112 pin and TQFP-120
pin versions) or 32-bit (QFP-144 pin
version) bidirectional data bus.
Bus control
CS0
–
CS3
O
Chip selects 0–3
Chip select signals for external
memory or devices.
RD
O
Read
Indicates reading from an external
device.
WRH
O
Upper write
Indicates writing the upper 8 bits
(15–8) of external data.
WRL
O
Lower write
Indicates writing the lower 8 bits
(7–0) of external data.
WAIT
I
Wait
Input causes insertion of wait cycles
into the bus cycle during external
space access.
RAS
O
Row address
strobe
Timing signal for DRAM row
address strobe.
CASH
O
Upper column
address strobe
Timing signal for DRAM column
address strobe.
Output when the upper 8 bits of
data are accessed.
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