M38227ECFP Renesas Electronics America, M38227ECFP Datasheet - Page 27

• 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: -

Fig. 20 Connection example when using key input interrupt and port P2 block diagram
24
Key Input Interrupt (Key-on wake-up)
A Key-on wake-up interrupt request is generated by applying a
falling edge to any pin of port P2 that have been set to input mode.
In other words, it is generated when AND of input level goes from
P 2
P 2
P2
P 2
P 2
P 2
P 2
P2
6
4
7
5
0
output
o u t p u t
1
o u t p u t
o u t p u t
3
2
i n p u t
i n p u t
i n p u t
input
P o r t P X
“ L ” l e v e l o u t p u t
PULL register A bit 2 = “1”
X
Port P2
latch
P o r t P 2
l a t c h
Port P2
latch
P o r t P 2
l a t c h
P o r t P 2
l a t c h
P o r t P 2
l a t c h
P o r t P 2
l a t c h
P o r t P 2
l a t c h
P - c h a n n e l t r a n s i s t o r f o r p u l l - u p
C M O S o u t p u t b u f f e r
3
2
0
7
6
5
4
1
Port P2
direction register = “1”
P o r t P 2
d i r e c t i o n r e g i s t e r = “ 1 ”
P o r t P 2
d i r e c t i o n r e g i s t e r = “ 1 ”
Port P2
direction register = “1”
Port P2
direction register = “0”
P o r t P 2
d i r e c t i o n r e g i s t e r = “ 0 ”
P o r t P 2
d i r e c t i o n r e g i s t e r = “ 0 ”
Port P2
direction register = “0”
7
6
5
“1” to “0”. An example of using a key input interrupt is shown in
Figure 20, where an interrupt request is generated by pressing
one of the keys consisted as an active-low key matrix which inputs
to ports P2
4
3
2
1
0
0
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
–P2
3
.
MITSUBISHI MICROCOMPUTERS
K e y i n p u t i n t e r r u p t r e q u e s t
3822 Group
P o r t P 2
I n p u t r e a d i n g c i r c u i t