SH7018 datasheet(23/431 Pages) RENESAS

23 / 431 page

1.3.2

Pin Functions

The pin functions are listed in table 1.2.

Table 1.2

Pin Functions

Type

Abbreviation

I/O

Name

Function

Power supply

Input

Power supply

Connect the power supply for

the entire system to the V

CC pin.

The chip will not function if this

pin is left open.

Input

Ground

Connect this pin to a ground.

Connect the ground for the

entire system to the V

SS pin. The

chip will not function if this pin is

left open.

Input

Power supply for

input/output circuit

This pin is the power supply for

an input/output circuit.

Clock

EXTAL

Input

External clock

Connect this pin to a crystal

oscillator. Alternately, the

EXTAL pin may be used for

external clock input.

XTAL

Input

Crystal

Connect this pin to a crystal

oscillator.

Output

System clock

Supplies the system clock signal

to peripheral devices.

System control

RES

Input

Power-on reset

Applying a low-level signal to

this pin triggers a power-on

reset.

Operating mode

control

MD0 to MD3

Input

Mode setting

This pin determines the

operating mode. Do not change

the input level while the system

is operating.

FWP

Input

Flash memory

write prevent

This pin is used to prevent

programming or erasing of the

flash memory.

Interrupts

NMI

Input

Non-maskable

interrupt

This is a non-maskable interrupt

request pin. The user can select

whether requests are accepted

at the rising or the falling edge.

IRQ0 to IRQ3,

IRQ6, IRQ7

Input

Interrupt request

0 to 3, 6, and 7

These are maskable interrupt

request pins. Level input and

edge input selection are

supported.

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