M38227ECFP Renesas Electronics America, M38227ECFP Datasheet - Page 20

• 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: -

I/O PORTS
Direction Registers (ports P2, P4
P5-P7)
The 3822 group has 49 programmable I/O pins arranged in seven
I/O ports (ports P0–P2, P4
P4
input/output direction of each individual pin. Each bit in a direction
register corresponds to one pin, and each pin can be set to be in-
put port or output port.
When “0” is written to the bit corresponding to a pin, that pin be-
comes an input pin. When “1” is written to that bit, that pin be-
comes an output pin.
If data is read from a pin set to output, the value of the port output
latch is read, not the value of the pin itself. Pins set to input are
floating. If a pin set to input is written to, only the port output latch
is written to and the pin remains floating.
Direction Registers (ports P0 and P1)
Ports P0 and P1 have direction registers which determine the in-
put/output direction of each individual port.
Each port in a direction register corresponds to one port, each port
can be set to be input or output. When “0” is written to the bit 0 of
a direction register, that port becomes an input port. When “1” is
written to that port, that port becomes an output port. Bits 1 to 7 of
ports P0 and P1 direction registers are not used.
Ports P3 and P4
These ports are only for input.
Pull-up/Pull-down Control
By setting the PULL register A (address 0016
ister B (address 0017
either pull-down or pull-up (pins that are shared with the segment
output pins for LCD are pull-down; all other pins are pull-up) with
a program.
However, the contents of PULL register A and PULL register B do
not affect ports programmed as the output ports.
1
–P4
7
and P5-P7 have direction registers which determine the
16
0
), ports except for port P4
1
–P4
7
and P5-P7). The I/O ports P2,
16
) or the PULL reg-
1
-P4
0
can control
7
, and
Fig. 14 Structure of PULL register A and PULL register B
b 7
b7
Note: The contents of PULL register A and PULL register B
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
do not affect ports programmed as the output port.
MITSUBISHI MICROCOMPUTERS
b 0
b 0
P U L L r e g i s t e r A
( P U L L A : a d d r e s s 0 0 1 6
P U L L r e g i s t e r B
( P U L L B : a d d r e s s 0 0 1 7
P0
P1
P2
P3
P7
Not used (return “0” when read)
P4
P4
P5
P5
P6
P6
Not used (return “0” when read)
0
0
0
4
0
1
4
0
4
0
4
–P0
–P1
–P2
–P3
, P7
–P4
–P4
–P5
–P5
–P6
–P6
7
7
7
7
1
3
7
3
7
3
7
pull-down
pull-down
pull-up
pull-down
pull-up
pull-up
pull-up
pull-up
pull-up
pull-up
pull-up
3822 Group
0 : D i s a b l e
1 : E n a b l e
1 6
1 6
)
)
17