upd78f0730 Renesas Electronics Corporation., upd78f0730 Datasheet - Page 73
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upd78f0730
Manufacturer Part Number
upd78f0730
Description
8-bit Single-chip Microcontroller
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.UPD78F0730.pdf
(518 pages)
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4.2.5 Port 12
using port mode register 12 (PM12). When used as an input port only for P120, use of an on-chip pull-up resistor can
be specified by pull-up resistor option register 12 (PU12).
and external clock input for main system clock.
Port 12 is a 3-bit I/O port with an output latch. Port 12 can be set to the input mode or output mode in 1-bit units
This port can also be used as pins for external interrupt request input, connecting resonator for main system clock,
Reset signal generation sets port 12 to input mode.
Figures 4-13 and 4-14 show block diagrams of port 12.
Cautions 1. When using the P121 and P122 pins to connect a resonator for the main system clock (X1,
Remark The X1 and X2 pins of the
OCD0B) when the on-chip debug function is used. For details, see CHAPTER 20 ON-CHIP DEBUG
FUNCTION.
2. When writing the flash memory with a flash memory programmer, connect P121/X1/OCD0A
X2) or to input an external clock for the main system clock (EXCLK), the X1 oscillation mode
or external clock input mode must be set by using the clock operation mode select register
(OSCCTL) (for details, see 5.3 (1) Clock operation mode select register (OSCCTL). The reset
value of OSCCTL is 00H (all of the P121 and P122 pins are I/O port pins). At this time, setting
of the PM121, PM122, P121, and P122 pins is not necessary.
as follows.
• P121/X1/OCD0A: When using this pin as a port, connect it to V
recommended) (in the input mode) or leave it open (in the output mode).
The above connection is not necessary when writing the flash memory by means of self
programming.
Preliminary User’s Manual U19014EJ1V0UD
µ
CHAPTER 4 PORT FUNCTIONS
PD78F0730 can be used as on-chip debug mode setting pins (OCD0A,
SS
via a resistor (10 kΩ:
73
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