upd78f0114hgb-8es-a Renesas Electronics Corporation., upd78f0114hgb-8es-a Datasheet - Page 477

• Manufacturer Part Number: upd78f0114hgb-8es-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

Port
Functions
Internal
oscillator
Main Clock
Subsystem
Clock
Main Clock
Subsystem
Clock
Function
P10, P11, P12
P31
Processor
Clock Control
Register (PCC)
Internal
oscillation
mode register
(RCM)
Main clock
mode register
(MCM)
Main OSC
control register
(MOC)
Details of
Function
Make sure that bit 1 (MCS) of the main clock mode register (MCM) is 0 before
To use P10/SCK10/TxD0, P11/SI10/RxD0, and P12/SO10 as general-purpose
ports, set serial operation mode register 10 (CSIM10) and serial clock selection
register 10 (CSIC10) to the default status (00H).
In the PD78F0114HD, be sure to pull the P31 pin down after reset to prevent
malfunction.
In the case of a 1-bit memory manipulation instruction, although a single bit is
manipulated, the port is accessed as an 8-bit unit. Therefore, on a port with a
mixture of input and output pins, the output latch contents for pins specified as
input are undefined, even for bits other than the manipulated bit.
Be sure to clear bit 3 to 0.
Make sure that bit 1 (MCS) of the main clock mode register (MCM) is 1 before
setting RSTOP.
When internal oscillation clock is selected as the clock to be supplied to the
CPU, the divided clock of the internal oscillator output (f
peripheral hardware (f
Operation of the peripheral hardware with internal oscillation clock cannot be
guaranteed. Therefore, when internal oscillation clock is selected as the clock
supplied to the CPU, do not use peripheral hardware. In addition, stop the
peripheral hardware before switching the clock supplied to the CPU from the
high-speed system clock to the internal oscillation clock. Note, however, that
the following peripheral hardware can be used when the CPU operates on the
internal oscillation clock.
• Watchdog timer
• Clock monitor
• 8-bit timer H1 when f
• Peripheral hardware selecting external clock as the clock source
Always switch subsystem clock operation to high-speed system clock operation
(bit 4 (CSS) of the processor clock control register (PCC) is changed from 1 to
0) with MCS = 1 and MCM0 = 1.
setting MSTOP.
To stop high-speed system clock oscillation when the CPU is operating on the
subsystem clock, set bit 7 (MCC) of the processor clock control register (PCC)
to 1 (setting by MSTOP is not possible).
(Except when external count clock of TM00 is selected (TI000 valid edge))
APPENDIX D LIST OF CAUTIONS
User’s Manual U16961EJ4V0UD
X
R
/2
= 240 kHz (TYP.)).
7
is selected as count clock
Cautions
X
) is supplied to the
p. 79
p. 85
p. 95
p. 99
p. 100
p. 101
p. 101
p. 102
p. 102
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