M38517F8FP Renesas Electronics America, M38517F8FP Datasheet - Page 43

• Manufacturer Part Number: M38517F8FP
• Description: MCU 8-Bit 740 CISC 32KB Flash 5V 42-Pin SSOP
• Manufacturer: Renesas Electronics America

Specifications of M38517F8FP

• Package: 42SSOP
• Family Name: 740
• Maximum Speed: 8 MHz
• Ram Size: 1 KB
• Program Memory Size: 32 KB
• Operating Supply Voltage: 5 V
• Data Bus Width: 8 Bit
• Program Memory Type: Flash
• Number Of Programmable I/os: 34
• Interface Type: I2C-BUS
• On-chip Adc: 5-chx10-bit
• Operating Temperature: -20 to 85 °C
• Number Of Timers: 4

3851 Group
Fig. 42 Structure of PWM control register
Fig. 43 PWM output timing when PWM register or PWM prescaler is changed
The PWM starts after the PWM function enable bit is set to enable and “L” level is output from the PWM pin.
The length of this “L” level output is as follows:
Rev.1.01
Note
b 7
PWM output
PWM prescaler
write signal
2 • f(X
PWM register
write signal
Oct 15, 2003
f(X
n+1
n+1
(Built-in 24 KB or more ROM)
IN
IN
)
When the contents of the PWM register or PWM prescaler have changed, the PWM
output will change from the next period after the change.
)
sec
sec
b 0
P W M c o n t r o l r e g i s t e r
( P W M C O N : a d d r e s s 0 0 1 D
P W M f u n c t i o n e n a b l e b i t
C o u n t s o u r c e s e l e c t i o n b i t
N o t u s e d ( r e t u r n “ 0 ” w h e n r e a d )
page 41 of 89
0 : P W M d i s a b l e d
1 : P W M e n a b l e d
0 : f ( X
1 : f ( X
(Count source selection bit = 0, where n is the value set in the prescaler)
(Count source selection bit = 1, where n is the value set in the prescaler)
I N
I N
) ( f ( X
) / 2 ( f ( X
C I N
A
C I N
) a t l o w - s p e e d m o d e )
) / 2 a t l o w - s p e e d m o d e )
T
1 6
)
(Changes “H” term from “A” to “B”.)
(Changes PWM period from “T” to “T2”.)
B
T
C
T2
B
T
=
T2
C