UPD30121 NEC [NEC], UPD30121 Datasheet - Page 15

• Manufacturer Part Number: UPD30121
• Description: VR4121TM 64-/32-BIT MICROPROCESSOR
• Manufacturer: NEC [NEC]

LEDOUT#
DBUS32/
GPIO48
SMODE1/
GPIO49
SMODE2
MIPS16EN
(13) LED interface signal
(14) Initial setting signals
Signal Name
Signal
I/O
O
I/O
I/O
I/O
I
I
This is an output signal for lighting LEDs.
The function differs depending on the operating status.
<During normal operation (output)>
<After an RTC reset (input)>
The function differs depending on the operating status.
<During normal operation (output)>
< After an RTC reset (input)>
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.
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.
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.
This can be used as a general-purpose output port.
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.
SMODE (2:1) signal
1: The data bus has a 32-bit width.
0: The data bus has a 16-bit width.
11
10
01
00
Data Sheet U14691EJ1V0DS00
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)
Function
Function
Used Memory
PD30121
15