UPD78F0413GA-GAM-AX NEC, UPD78F0413GA-GAM-AX Datasheet - Page 126

• Manufacturer Part Number: UPD78F0413GA-GAM-AX
• Description: 8BIT UC, 32K FLASH, 1KB RAM, LCD
• Manufacturer: NEC

Specifications of UPD78F0413GA-GAM-AX

• Controller Family/series: UPD78F
• No. Of I/o's: 30
• Ram Memory Size: 1024Byte
• Cpu Speed: 10MHz
• No. Of Timers: 8
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 32KB
• Oscillator Type: External, Internal

126
Subsystem clock (f
<1> When the power is turned on, an internal reset signal is generated by the power-on-clear (POC) circuit.
Cautions 1. A voltage oscillation stabilization time of 1.93 to 5.39 ms is required after the supply voltage
Remark While the microcontroller is operating, a clock that is not used as the CPU clock can be stopped via
(when XT1 oscillation
Note
<2> When the power supply voltage exceeds 2.7 V (TYP.), the reset is released and the internal high-speed
<3> After the reset is released and reset processing is performed, the CPU starts operation on the internal high-
<4> Set the start of oscillation of the X1 or XT1 clock via software (see (1) in 5.6.1 Example of controlling high-
<5> When switching the CPU clock to the X1 or XT1 clock, wait for the clock oscillation to stabilize, and then set
oscillation clock (f
Internal reset signal
Internal high-speed
(when X1 oscillation
system clock (f
Power supply
voltage (V
oscillator automatically starts oscillation.
speed oscillation clock.
speed system clock and (1) in 5.6.3 Example of controlling subsystem clock).
switching via software (see (3) in 5.6.1 Example of controlling high-speed system clock and (3) in 5.6.3
Example of controlling subsystem clock).
High-speed
CPU clock
When releasing a reset (above figure) or releasing STOP mode while the CPU is operating on the internal
high-speed oscillation clock, confirm the oscillation stabilization time for the X1 clock using the oscillation
stabilization time counter status register (OSTC). If the CPU operates on the high-speed system clock (X1
oscillation), set the oscillation stabilization time when releasing STOP mode using the oscillation
stabilization time select register (OSTS).
selected)
selected)
software settings.
stopped by executing the STOP instruction (see (4) in 5.6.1
system clock, (3) in 5.6.2 Example of controlling internal high-speed oscillation clock, and (4) in
5.6.3 Example of controlling subsystem clock).
2. It is not necessary to wait for the oscillation stabilization time when an external clock input
Figure 5-14. Clock Generator Operation When Power Supply Voltage Is Turned On
DD
SUB
0 V
RH
XH
)
)
)
)
reaches 1.59 V (TYP.). If the supply voltage rises from 1.59 V (TYP.) to 2.7 V (TYP.) within 1.93
ms, the power supply oscillation stabilization time of 0 to 5.39 ms is automatically generated
before reset processing.
from the EXCLK pin is used.
<1>
(When 2.7 V/1.59 V POC Mode Is Set (Option Byte: POCMODE = 1))
Waiting for oscillation accuracy
The internal high-speed oscillation clock and high-speed system clock can be
stabilization (86 to 361 s )
2.7 V (TYP.)
CHAPTER 5 CLOCK GENERATOR
Starting X1 oscillation
is specified by software.
User’s Manual U18698EJ1V0UD
<3>
<2>
Starting XT1 oscillation
is specified by software.
Reset processing
<4>
(11 to 47 s )
oscillation stabilization time:
Internal high-speed
oscillation clock
2
<4>
11
/f
X1 clock
X
to 2
16
/f
X
Note
<5>
High-speed system clock
Example of controlling high-speed
Switched by
software
<5>
Subsystem clock