UPD17073 NEC, UPD17073 Datasheet - Page 183

• Manufacturer Part Number: UPD17073
• Description: 4-BIT SINGLE-CHIP MICROCONTROLLER WITH HARDWARE FOR DIGITAL TUNING SYSTEM
• Manufacturer: NEC

General-
purpose
I/O port
General-
purpose
input
port
General-
purpose
output
port
Interrupt
CE reset
Pin function
Port 0B
Port 0C
Port 0D
Port 1A
Port 0A
Port 1B
Port 1C
Table 19-2. Pin Status in Halt and Clock Stop Statuses and Notes (1/2)
P0B3/SI/SO1
P0B2/SCK
P0B1
P0B0
P0C1
P0C0
P0D3/FMIFC/AMIFC
P0D2/AMIFC
P1A3/AD1
P1A2/AD0
P1A1
P1A0
P0A3
P0A0
P1B3
P1B0
P1C0/SO0
INT
CE
|
|
Pin symbol
Hold status immediately before halt status.
Current consumption increases by external noise if this pin is floated.
Current consumption increases by external noise if this pin is floated.
(1) When specified as output pins
(2) When specified as input pins
(3) Port 1A (P1A3/AD1, P1A2/AD0,
(4) P0D3/FMIFC/AMIFC, P0D2/AMIFC
Current consumption increases if any
of these pins is externally pulled down
while it outputs high level, or exter-
nally pulled up when it outputs low
level.
(Except P1A3/AD1, P1A2/AD0, P1A1,
P1A0)
Current consumption by noise does
not increase if any of these pins is
floated.
P1A1, P1A0)
Current consumption increases if these
pins externally pulled up when they
selected pull-down resistors ON by
program.
When pull-down resistor OFF is
selected, these pins are floated and
current consumption by noise
increases.
When P0D3/FMIFC/AMIFC, P0D2/
AMIFC pins are used for frequency
counter, current consumption in-
creases because internal amplifier
operates.
Initialize frequency counter by pro-
gram as necessary because it is not
automatically disabled even when CE
pin is low.
Halt status
Pin status and note on processing
All pins are specified as general-purpose
input port pins.
At this time, all input ports except port 1A
(P1A3/AD1, P1A2/AD0, P1A1, P1A0) do
not increase current consumption by noise,
even if they are floated.
Port 1A (P1A3/AD1, P1A2/AD0, P1A1,
P1A0) is retained the status before clock
stop.
(1) When pull-down resistor ON is
(2) When pull-down resistor OFF is
These ports are specified as general-
purpose output ports.
The output contents are retained as is.
Therefore, current consumption increases
if these ports are externally pulled down
while they output high level, or pulled up
while they output low level.
selected by program:
Current consumption increases if these
pins externally pulled up.
selected by program:
These pins are floated and current
consumption by noise increases.
Clock stop status
PD17072,17073
183