M37544G2AGP Renesas Electronics America, M37544G2AGP Datasheet - Page 17

• Manufacturer Part Number: M37544G2AGP
• Description: MCU 2/5V 8K 32-LQFP
• Manufacturer: Renesas Electronics America
• Series: 740/38000r

Specifications of M37544G2AGP

• Core Processor: 740
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SIO, UART/USART
• Peripherals: WDT
• Number Of I /o: 25
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: QzROM
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 6x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 32-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

Rev.1.04
REJ03B0012-0104Z
7544 Group
I/O Ports
[Direction registers] PiD
The I/O ports have direction registers which determine the input/
output direction of each pin. Each bit in a direction register corre-
sponds to one pin, and each pin can be set to be input or output.
When “1” is set to the bit corresponding to a pin, this pin becomes
an output port. When “0” is set to the bit, the pin becomes an in-
put port.
When data is read from a pin set to output, not the value of the pin
itself but the value of port latch is read. Pins set to input are float-
ing, and permit reading pin values.
If a pin set to input is written to, only the port latch is written to and
the pin remains floating.
Fig. 15 Structure of pull-up control register
Fig. 16 Structure of port P1P3 control register
2004.06.08
Note : Pins set to output ports are disconnected from pull-up control.
b7
b7
page 15 of 66
b0
Pull-up control register
b0
(PULL: address 0016
P0
P0
P0
P0
P3
P3
Disable
P3
Port P1P3 control register
(P1P3C: address 0017
0
1
2
4
0
4
7
, P0
P3
P3
P1
Disable
– P0
– P3
pull-up control bit
pull-up control bit
pull-up control bit
pull-up control bit
7
4
0
/INT
/INT
,P1
3
0 : CMOS level
1 : TTL level
0 : CMOS level
1 : TTL level
0 : CMOS level
1 : TTL level
[Pull-up control register] PULL
By setting the pull-up control register (address 0016
and P3 can exert pull-up control by program. However, pins set to
output are disconnected from this control and cannot exert pull-up
control.
[Port P1P3 control register] P1P3C
By setting the port P1P3 control register (address 0017
CMOS input level or a TTL input level can be selected for ports
P1
7
3
pull-up control bit
2
pull-up control bit
pull-up control bit
0
1
0
input level selection bit
, P1
input level selection bit
input level selection bit
2
, P3
16
, initial value: 00
4
, and P3
16
, initial value: 00
7
0 : Pull-up Off
1 : Pull-up On
by program.
16
)
16
)
16
), ports P0
16
), a