M38227ECFP Renesas Electronics America, M38227ECFP Datasheet - Page 30

• Manufacturer Part Number: M38227ECFP
• Description: IC 740 MCU EPROM 48K 80QFP
• Manufacturer: Renesas Electronics America
• Series: 740/38000r

Specifications of M38227ECFP

• Core Processor: 740
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SIO, UART/USART
• Peripherals: LCD
• Number Of I /o: 49
• Program Memory Size: 48KB (48K x 8)
• Program Memory Type: OTP
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 2.5 V ~ 5.5 V
• Data Converters: A/D 8x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 80-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

Timer Y
Timer Y is a 16-bit timer that can be selected in one of four modes.
(1) Timer Mode
The timer counts f(X
(2) Period Measurement Mode
CNTR
CNTR
is reloaded in timer Y and timer Y continues counting down. Ex-
cept for the above-mentioned, the operation in period
measurement mode is the same as in timer mode.
The timer value just before the reloading at rising/falling of CNTR
pin input signal is retained until the timer Y is read once after the
reload.
The rising/falling timing of CNTR
CNTR
sponding port P5
(3) Event Counter Mode
The timer counts signals input through the CNTR
Except for this, the operation in event counter mode is the same
as in timer mode. When using a timer in this mode, set the corre-
sponding port P5
(4) Pulse Width HL Continuously Measurement
CNTR
edges of CNTR
pulse width HL continuously measurement mode is the same as in
period measurement mode. When using a timer in this mode, set
the corresponding port P5
CNTR
switch bit. However, in pulse width HL continuously measurement
mode, CNTR
falling edges of CNTR
CNTR
Note on CNTR
Mode
1
1
1
1
1
1
active edge switch bit.
pin input signal. Simultaneously, the value in timer Y latch
interrupt. When using a timer in this mode, set the corre-
interrupt active edge depends on the CNTR
interrupt request is generated at rising/falling edge of
interrupt request is generated at both rising and falling
1
interrupt request is generated at both rising and
1
5
5
pin input signal. Except for this, the operation in
direction register to input mode.
direction register to input mode.
IN
1
)/16 (or f(X
1
interrupt active edge selection
pin input signal regardless of the setting of
5
direction register to input mode.
CIN
1
)/16 in low-speed mode).
pin input signal is found by
1
pin.
1
active edge
1
Fig. 23 Structure of timer Y mode register
b7
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
b 0
MITSUBISHI MICROCOMPUTERS
N o t u s e d ( r e t u r n “ 0 ” w h e n r e a d )
T i m e r Y o p e r a t i n g m o d e b i t s
C N T R
T i m e r Y s t o p c o n t r o l b i t
T i m e r Y m o d e r e g i s t e r
( T Y M : a d d r e s s 0 0 2 8
b 5 b 4
0 : C o u n t a t r i s i n g e d g e i n e v e n t c o u n t e r m o d e
1 : C o u n t a t f a l l i n g e d g e i n e v e n t c o u n t e r m o d e
0 : C o u n t s t a r t
1 : C o u n t s t o p
0
0
1
1
M e a s u r e t h e f a l l i n g e d g e t o f a l l i n g e d g e
p e r i o d i n p e r i o d m e a s u r e m e n t m o d e
F a l l i n g e d g e a c t i v e f o r C N T R
M e a s u r e t h e r i s i n g e d g e p e r i o d i n p e r i o d
m e a s u r e m e n t m o d e
R i s i n g e d g e a c t i v e f o r C N T R
0 : T i m e r m o d e
1 : P e r i o d m e a s u r e m e n t m o d e
0 : E v e n t c o u n t e r m o d e
1
1 : P u l s e w i d t h H L c o n t i n u o u s l y m e a s u r e m e n t
m o d e
a c t i v e e d g e s w i t c h b i t
1 6
)
3822 Group
1
1
i n t e r r u p t
i n t e r r u p t
27