M38039G4HHP#U0 Renesas Electronics America, M38039G4HHP#U0 Datasheet - Page 87

• Manufacturer Part Number: M38039G4HHP#U0
• Description: IC 740/3803 MCU QZROM 64LQFP
• Manufacturer: Renesas Electronics America
• Series: 740/38000r

Specifications of M38039G4HHP#U0

• Core Processor: 740
• Core Size: 8-Bit
• Speed: 16.8MHz
• Connectivity: SIO, UART/USART
• Peripherals: LED, PWM, WDT
• Number Of I /o: 56
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: QzROM
• Ram Size: 2K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 16x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 64-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

3803 Group (Spec.H QzROM version)
REJ03B0166-0113 Rev.1.13
Page 85 of 100
3. Clock frequency during A/D conversion
The comparator consists of a capacity coupling, and a charge of
the capacity will be lost if the clock frequency is too low. Thus,
make sure the following during an A/D conversion.
• f(X
• Do not execute the STP instruction
4. Difference between at 8-bit reading in 10-bit A/D
At 8-bit reading in the 10-bit A/D mode, “–1/2 LSB” correction
is not performed to the A/D conversion result.
In the 8-bit A/D mode, the A/D conversion characteristics is the
same as 3802 group’s characteristics because “–1/2 LSB”
correction is performed.
Notes on D/A Converter
1. V
The D/A converter accuracy when V
from that of when V
converter, we recommend using a V
2. D/Ai conversion register when not using D/A con-
When a D/A converter is not used, set all values of the D/Ai
conversion registers (i = 1, 2) to “00
reset is “00
Notes on Watchdog Timer
• Make sure that the watchdog timer H does not underflow
• When the STP instruction function selection bit has been set to
Notes on RESET Pin
Connecting capacitor
In case where the RESET signal rise time is long, connect a
ceramic capacitor or others across the RESET pin and the V
pin.
Use a 1000 pF or more capacitor for high frequency use. When
connecting the capacitor, note the following:
• Make the length of the wiring which is connected to a
• Be sure to verify the operation of application products on the
<Reason>
If the several nanosecond or several ten nanosecond impulse
noise enters the RESET pin, it may cause a microcomputer
failure.
Notes on Low-speed Operation Mode
1. Using sub-clock
To use a sub-clock, fix bit 3 of the CPU mode register to “1” or
control the Rd (refer to Figure 83) resistance value to a certain
level to stabilize an oscillation. For resistance value of Rd,
consult the oscillator manufacturer.
while waiting Stop release, because the watchdog timer keeps
counting during that term.
“1”, it is impossible to switch it to “0” by a program.
capacitor as short as possible.
user side.
mode and at 8-bit A/D mode
verter
CC
IN
) is 500 kHz or more
when using D/A converter
16
”.
CC
is 4.0 V or more. When using the D/A
CC
16
CC
Aug 21, 2009
of 4.0 V or more.
”. The initial value after
is 4.0 V or less differs
SS
Fig 83. Ceramic resonator circuit
<Reason>
When bit 3 of the CPU mode register is set to “0”, the sub-clock
oscillation may stop.
2. Switch between middle/high-speed mode and low-
If you switch the mode between middle/high-speed and low-
speed, stabilize both X
time is required for the sub clock to stabilize, especially
immediately after power on and at returning from stop mode.
When switching the mode between middle/high-speed and low-
speed, set the frequency on condition that f(X
Quartz-Crystal Oscillator
When using the quartz-crystal oscillator of high frequency, such
as 16 MHz etc., it may be necessary to select a specific oscillator
with the specification demanded.
Notes on Restarting Oscillation
• Restarting oscillation
Usually, when the MCU stops the clock oscillation by STP
instruction and the STP instruction has been released by an
external interrupt source, the fixed values of Timer 1 and
Prescaler 12 (Timer 1 = “01
automatically reloaded in order for the oscillation to stabilize.
The user can inhibit the automatic setting by writing “1” to bit 0
of MISRG (address 0010
However, by setting this bit to “1”, the previous values, set just
before the STP instruction was executed, will remain in Timer 1
and Prescaler 12. Therefore, you will need to set an appropriate
value to each register, in accordance with the oscillation
stabilizing time, before executing the STP instruction.
<Reason>
Oscillation will restart when an external interrupt is received.
However, internal clock
Timer 1 starts to underflow. This ensures time for the clock
oscillation using the ceramic resonators to be stabilized.
speed mode
X
CIN
IN
C
16
CIN
φ
and X
).
is supplied to the CPU only when
Rf
16
CIN
”, Prescaler 12 = “FF
X
COUT
oscillations. The sufficient
Rd
C
COUT
IN
) > 3×f(X
16
CIN
”) are
).