SH7011 Datasheet, PDF (17/292 Pages) Renesas Technology Corp – CMOS single-chip microprocessors

1.3.2 Pin Functions
Table 1.1 lists the pin functions.
Table 1.1 Pin Functions
Classification Symbol I/O
Power supply V_CC
I
V_SS
I
Clock
EXTAL
I
XTAL
I
CK
O
System control RES
I
Interrupts
NMI
I
IRQ0–IRQ7 I
Address bus
Data bus
Bus control
A1–A21 O
D0–D15 I/O
CS0 to CS3 O
RD
O
WRH
O
WRL
O
WAIT
I
Name
Function
Supply
Connects to power supply.
Connect all V_CC pins to the system
supply. No operation will occur if there
are any open pins.
Ground
Connects to ground.
Connect all V_SS pins to the system
ground. No operation will occur if there
are any open pins.
External clock
Connect a crystal oscillator. Also, an
external clock can be input to the
EXTAL pin.
Crystal
Connect a crystal oscillator.
System clock
Supplies the system clock to
peripheral devices.
Power-on reset Power-on reset when low
Non-maskable
interrupt
Non-maskable interrupt request pin.
Enables selection of whether to accept
on the rising or falling edge.
Interrupt
requests 0–7
Maskable interrupt request pins.
Allows selection of level input and
edge input.
Address bus
Outputs addresses.
Data bus
16-bit bidirectional data bus.
Chip selects 0–3 Chip select signals for external
memory or devices.
Read
Indicates reading from an external
device.
Upper write
Indicates writing the upper 8 bits (15–
8) of external data.
Lower write
Indicates writing the lower 8 bits
(7–0) of external data.
Wait
Input causes insertion of wait cycles
into the bus cycle during external
space access.
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