H83028 datasheet(39/923 Pages) RENESAS

39 / 923 page

Rev. 2.00, 09/03, page 9 of 890

Pin No.

Type

Symbol

FP-100B

TFP-100B

I/O

Name and Function

System

control

RES

Input

Reset input: When driven low, this pin resets

the chip

RESO

Output

Reset output (mask ROM version): Outputs

the reset signal generated by the watchdog timer

to an external device

FWE

Input

Write enable signal (F-ZTAT version): Flash

memory write control signal

STBY

Input

Standby: When driven low, this pin forces a

transition to hardware standby mode

BREQ

Input

Bus request: Used by an external bus master to

request the bus right

BACK

Output

Bus request acknowledge: Indicates that the

bus has been granted to an external bus master

Interrupts

NMI

Input

Nonmaskable interrupt: Requests a

nonmaskable interrupt

IRQ5 to

IRQ0

17, 16,

90 to 87

Input

Interrupt request 5 to 0: Maskable interrupt

request pins

Address

bus

A23 to A0

97 to 100,

56 to 45,

43 to 36

Output

Address bus: Outputs address signals

Data bus

D15 to D0

34 to 23,

21 to 18

Input/

output

Data bus: Bidirectional data bus

Bus

control

CS7 to CS0

2 to 5,

88 to 91

Output

Chip select: Select signals for areas 7 to 0

Output

Address strobe: Goes low to indicate valid

address output on the address bus

Output

Read: Goes low to indicate reading from the

external address space

HWR

Output

High write: Goes low to indicate writing to the

external address space; indicates valid data on

the upper data bus (D15 to D8).

LWR

Output

Low write: Goes low to indicate writing to the

external address space; indicates valid data on

the lower data bus (D7 to D0).

WAIT

Input

Wait: Requests insertion of wait states in bus

cycles during access to the external address

space

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