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UPD30121 Datasheet(PDF) 22 Page - NEC

Part # UPD30121
Description  VR4121TM 64-/32-BIT MICROPROCESSOR
PDF  76 Pages
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

UPD30121 Datasheet(HTML) 22 Page - NEC

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Data Sheet U14691EJ1V0DS00
22
µµµµPD30121
(2/3)
Pin Name
Internal
Processing
External
Processing
Drive
Capability
I/O Circuit
Type
Recommended
Connection of
Unused Pins
HLDRQ#
Note
Pull up
−
A
Directly connect to VDD
HLDACK#
Slew rate buffer
−
40 pF
A
Leave open
CKE
−−
120 pF
A
Leave open
RTCX1
−
Resonator
−−−
RTCX2
−
Resonator
−−
Leave open
CLKX1
−
Resonator
−−−
CLKX2
−
Resonator
−−
Leave open
FIRCLK
−
Resonator
−
A
Directly connect to VDD
BATTINH/
BATTINT#
Schmitt input
−−
B
Directly connect to VDD
MPOWER
−−
40 pF
A
Leave open
POWERON
−−
40 pF
A
Leave open
POWER
Schmitt input
−−
B
−
RSTSW#
Schmitt input
−−
B
−
RTCRST#
Schmitt input
−−
B
−
RxD
−−−
A
Connect to GND
TxD/CLKSEL2
−
Pull up/
Pull down
40 pF
A
−
RTS#/CLKSEL1
−
Pull up/
Pull down
40 pF
A
−
CTS#
−−−
A
Connect to VDD
DCD#/GPIO15
Schmitt input
Pull up
−
B
Connect to VDD or
GND
DTR#/CLKSEL0
−
Pull up/
Pull down
40 pF
A
−
DSR#
−−−
A
Connect to VDD
IRDIN
−
Pull up
−
A
Connect to VDD or
GND
IRDOUT#
−−
40 pF
A
Leave open
FIRDIN#/SEL
−
Pull up/
Pull down
40 pF
A
Connect to VDD via
resistor
DDIN/GPIO45
−−
40 pF
A
Connect to VDD or
GND via resistor
DDOUT/GPIO44
−−
40 pF
A
Leave open
DRTS#/GPIO46
−−
40 pF
A
Leave open
DCTS#/GPIO47
−−
40 pF
A
Connect to VDD or
GND via resistor
Note Intermediate-level input is enabled when the MPOWER pin is set for low-level output.
Remarks 1. No specification (
−) in the External Processing column indicates that the external processing is
unnecessary.
2. No specification (
−) in the Recommended Connection of Unused Pins column indicates that the pin
is always connected.



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