UPD78P4908 datasheet(13/64 Pages) NEC

13 / 64 page

µPD78P4908

Data Sheet U11681EJ2V0DS00

(2) Non-port pins (1/2)

TO0-TO3

RxD

RxD2

TxD

TxD2

ASCK

ASCK2

SI0

SI1

SI2

SI3

SO0

SO1

SO2

SO3

SCK0

SCK1

SCK2

SCK3

NMI

INTP0

INTP1

INTP2

INTP3

INTP4

INTP5

AD0-AD7

A8-A15

A16-A19

WAIT

REFRQ

HLDRQ

HLDAK

ASTB

I/O

Output

Input

Output

Input

Output

I/O

Input

I/O

Output

Input

Output

Input

Output

Function

Timer output

Input of a count clock for timer/counter 2

Serial data input (UART0)

Serial data input (UART2)

Serial data output (UART0)

Serial data output (UART2)

Baud rate clock input (UART0)

Baud rate clock input (UART2)

Serial data input (3-wire serial I/O 0)

Serial data input (3-wire serial I/O 1)

Serial data input (3-wire serial I/O 2)

Serial data input (3-wire serial I/O 3)

Serial data output (3-wire serial I/O 0)

Serial data output (3-wire serial I/O 1)

Serial data output (3-wire serial I/O 2)

Serial data output (3-wire serial I/O 3)

Serial clock I/O (3-wire serial I/O 0)

Serial clock I/O (3-wire serial I/O 1)

Serial clock I/O (3-wire serial I/O 2)

Serial clock I/O (3-wire serial I/O 3)

External interrupt request

—

• Input of a count clock for timer/counter 1

• Capture/trigger signal for CR11 or CR12

• Input of a count clock for timer/counter 2

• Capture/trigger signal for CR22

• Input of a count clock for timer/counter 2

• Capture/trigger signal for CR21

• Input of a count clock for timer/counter 0

• Capture/trigger signal for CR02

—

Input of a conversion start trigger for A/D converter

Time multiplexing address/data bus (for connecting external memory)

High-order address bus (for connecting external memory)

High-order address during address expansion (for connecting external memory)

Strobe signal output for reading the contents of external memory

Strobe signal output for writing on external memory

Wait signal insertion

Refresh pulse output to external pseudo static memory

Input of bus hold request

Output of bus hold response

Latch timing output of time multiplexing address (A0-A7) (for connecting

external memory)

Also used as

P34-P37

P23/INTP2

P30/SI1

P13/SI2

P31/SO1

P14/SO2

P25/INTP4/SCK1

P12/SCK2

P27

P30/RxD

P13/RxD2

P106

P33

P31/TxD

P14/TxD2

P107

P32

P25/INTP4/ASCK

P12/ASCK2

P105

P20

P21

P22

P23/CI

P24

P25/ASCK/SCK1

P26

P40-P47

P50-P57

P60-P63

P64

P65

P66/HLDRQ

P67/HLDAK

P66/WAIT

P67/REFRQ

CLKOUT

UPD78P4908 Datasheet(PDF) 13 Page - NEC

UPD78P4908 Datasheet(HTML) 13 Page - NEC

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