M38513E4FP#U0 Renesas Electronics America, M38513E4FP#U0 Datasheet - Page 34

• Manufacturer Part Number: M38513E4FP#U0
• Description: IC 740 MCU ROM 16K 42SSOP
• Manufacturer: Renesas Electronics America
• Series: 740/38000r

Specifications of M38513E4FP#U0

• Core Processor: 740
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SIO, UART/USART
• Peripherals: PWM, WDT
• Number Of I /o: 34
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: OTP
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 5x10b
• Oscillator Type: External
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 42-SSOP
• Package: 42SSOP
• Family Name: 740
• Maximum Speed: 8 MHz
• Operating Supply Voltage: 5 V
• Data Bus Width: 8 Bit
• Number Of Programmable I/os: 34
• Interface Type: I2C-BUS
• On-chip Adc: 5-chx10-bit
• Number Of Timers: 4
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

PULSE WIDTH MODULATION (PWM)
The 3851 group has a PWM function with an 8-bit resolution,
based on a signal that is the clock input X
vided by 2.
Data Setting
The PWM output pin also functions as port P4
riod by the PWM prescaler, and set the “H” term of output pulse by
the PWM register.
If the value in the PWM prescaler is n and the value in the PWM
register is m (where n = 0 to 255 and m = 0 to 255) :
PWM period = 255
Output pulse “H” term = PWM period
Fig. 33 Block diagram of PWM function
X
f(X
= 31.875
= 0.125
IN
(when f(X
IN
))
Data bus
(n+1)
1/2
IN
(n+1) s (when f(X
) = 8 MHz, count source = f(X
(n+1) / f(X
“0”
“1”
Count source
selection bit
m s
IN
)
prescaler pre-latch
IN
PWM prescaler
prescaler latch
m / 255
) = 8 MHz, count source =
IN
PWM
PWM
or that clock input di-
4
. Set the PWM pe-
Transfer control circuit
IN
))
register pre-latch
PWM register
register latch
PWM
PWM
PWM Operation
When bit 0 (PWM enable bit) of the PWM control register is set to
“1”, operation starts by initializing the PWM output circuit, and
pulses are output starting at an “H”.
If the PWM register or PWM prescaler is updated during PWM
output, the pulses will change in the cycle after the one in which
the change was made.
Fig. 32 Timing of PWM period
m : C o n t e n t s o f P W M r e g i s t e r
n : C o n t e n t s o f P W M p r e s c a l e r
T : P W M p e r i o d ( w h e n f ( X
PWM output
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
Port P4
3 1 . 8 7 5
MITSUBISHI MICROCOMPUTERS
4
T = [ 3 1 . 8 7 5
latch
2 5 5
PWM enable bit
I N
m
) = 8 M H z , c o u n t s o u r c e = f ( X
(Built-in 16 KB ROM)
( n + 1 )
( n + 1 ) ] s
s
3851 Group
Port P4
4
I N
) )
31