UPD77019 datasheet(13/56 Pages) NEC

13 / 56 page

µPD77018A, 77019

Symbol

Pin No.

I/O

Function

HA1

Specifies register which HD7 to HD0 access

Accesses HST:

Host interface status register

when HA1 = 0

Accesses HDT(in): Host transmit data register when

HWR = 0

Accesses HDT(out): Host receive data register when

HRD = 0

HA0

Specifies bits of registers which HD7 to HD0 access

• 1: Accesses bits 15-8 of HST, HDT(in) or HDT(out)

• 0: Accesses bits 7-0 of HST, HDT(in) or HDT(out)

HCS

Chip select input

HRD

Host read input

HWR

Host write input

HRE

Host read enable output

HWE

Host write enable output

HD7 - HD0

70 - 77

I/O (3S)

8 bits host data bus

• Host interface

Remark

The state of the pins added 3S becomes high impedance when the host does not access host interface.

• I/O port

Symbol

Pin No.

I/O

Function

P3 - P0

62 - 65

I/O

I/O port

UPD77019 Datasheet(PDF) 13 Page - NEC

UPD77019 Datasheet(HTML) 13 Page - NEC

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