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UPD784938 Datasheet(PDF) 63 Page - NEC

Part # UPD784938
Description  16-Bit Single-Chip Microcontrollers
Download  733 Pages
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

UPD784938 Datasheet(HTML) 63 Page - NEC

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CHAPTER 2 PIN FUNCTIONS
63
Preliminary User’s Manual U13987EJ1V0UM00
Table 2-5. Pin Input/Output Circuit Types and Recommended Connection of Unused Pins (2/2)
Pin Name
Input/Output
Input/Output
Recommended Connection
Circuit Type
of Unused Pins
P70/ANI0 to P77/ANI7
20
Input/output
Input:
Connect to VDD or VSS
P90 to P97
5-A
Output: Leave open
P100 to P104
P105/SCK3
10-A
P106/SI3
8-A
P107/SO3
10-A
ASTB/CLKOUT
4
Output
Leave open
RESET
2
Input
—
IC/VPPNote
1
Directly connect to VSS
XT2
—
—
Leave open
XT1
—
Input
Connect to VSS
REGOFF
1
Connect to VDD
REGC
—
—
PWM0, PWM1
3
Output
Leave open
RX
2
Input
Connect to VDD or VSS
TX
3
Output
Leave open
AVREF1
—
Input
Connect to VSS
AVSS
AVDD
Connect to VDD
Note
The VPP pin is used only in the
µPD78F4938.
Caution
If the input/output mode is undefined for an input/output alternate-function pin, it should be connected
to VDD via a resistor of several tens of k
Ω (especially when the reset input pin goes to the low-level input
voltage or over upon powering on, and when input/output is switched by software.)
Remark
The type numbers are standard for the 78K Series, and therefore are not necessarily serial numbers within each
product (there are non-incorporated circuits).


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