UPD30121 datasheet(15/76 Pages) NEC

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Data Sheet U14691EJ1V0DS00

µµµµPD30121

(13) LED interface signal

Signal

I/O

Function

LEDOUT#

This is an output signal for lighting LEDs.

(14) Initial setting signals

Signal Name

I/O

Function

DBUS32/

GPIO48

I/O

The function differs depending on the operating status.

This can be used as a general-purpose output port.

This is the switching signal for the data bus width. This signal is sampled at 1RTC clock cycle

after the RTCRST# signal changes from low level to high level.

1: The data bus has a 32-bit width.

0: The data bus has a 16-bit width.

SMODE1/

GPIO49

I/O

The function differs depending on the operating status.

This can be used as a general-purpose output port.

< After an RTC reset (input)>

This is a switching signal for the memory being used. It is used in combination with the

SMODE2 signal. This signal is sampled at 1RTC clock cycle after the RTCRST# signal

changes from low level to high level.

SMODE2

This a switching signal for the memory being used. It is used in combination with the SMODE1

signal. This signal is sampled when the RTCRST# signal changes from low level to high level.

The relation between the SMODE (2:1) signal and the memory being used is shown below.

MIPS16EN

This pin enables the use of MIPS16 instructions. This signal is sampled at 1RTC clock cycle after

the RTCRST# signal changes from low level to high level.

1: Enables the use of MIPS16 instructions.

0: Disables the use of MIPS16 instructions.

SMODE (2:1) signal

Used Memory

ROM: SROM

RAM: SDRAM

ROM: Flash memory, PageROM, ordinary ROM

RAM: SDRAM

ROM (boot bank): Flash memory, PageROM, ordinary ROM

ROM (except boot bank): SROM

RAM: SDRAM

ROM: Flash memory, PageROM, ordinary ROM

RAM: DRAM (EDO type)

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