M37542F8FP Renesas Electronics America, M37542F8FP Datasheet - Page 32

• Manufacturer Part Number: M37542F8FP
• Description: IC 740 MCU FLASH 32K 36SSOP
• Manufacturer: Renesas Electronics America
• Series: 740/38000r

Specifications of M37542F8FP

• Core Processor: 740
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SIO, UART/USART
• Peripherals: POR, WDT
• Number Of I /o: 29
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 2.2 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 36-SSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

7542 Group
Key Input Interrupt (Key-On Wake-Up)
A key-on wake-up interrupt request is generated by applying “L”
level to any pin of port P0 that has been set to input mode.
In other words, it is generated when the AND of input level goes
from “1” to “0”. An example of using a key input interrupt is shown
in Figure 28, where an interrupt request is generated by pressing
one of the keys provided as an active-low key matrix which uses
ports P0
Fig. 28 Connection example when using key input interrupt and port P0 block diagram
Rev.3.03
REJ03B0006-0303
0
to P0
Jul 11, 2008
3
as input ports.
P0
P0
P0
P0
P0
P0
P0
P0
7
6
5
4
3
2
1
0
output
output
output
output
input
input
input
input
Port PXx
“L” level output
Page 30 of 117
Port P0
selection bit
Port P0
selection bit
Port P0
selection bit
*
*
*
*
*
*
*
*
0
6
4
PULL register
bit 3 = “0”
PULL register
bit 3 = “0”
PULL register
bit 3 = “0”
PULL register
bit 3 = “0”
PULL register
bit 2 = “1”
PULL register
bit 2 = “1”
PULL register
bit 1 = “1”
PULL register
bit 0 = “1”
key-on wakeup
key-on wakeup
key-on wakeup
**
**
**
**
**
**
**
**
Port P0
latch
Port P0
latch
Port P0
latch
Port P0
latch
Port P0
latch
Port P0
latch
Port P0
latch
Port P0
latch
7
6
5
4
3
2
1
0
Port P0
Direction register = “1”
Port P0
Direction register = “1”
Port P0
Direction register = “1”
Port P0
Direction register = “1”
Port P0
Direction register = “0”
Port P0
Direction register = “0”
Port P0
Direction register = “0”
Port P0
Direction register = “0”
7
6
5
4
3
2
1
0
Falling edge
detection
Falling edge
detection
Falling edge
detection
Falling edge
detection
Falling edge
detection
Falling edge
detection
Falling edge
detection
Falling edge
detection
** CMOS output buffer
* P-channel transistor for pull-up
Key input interrupt request
Port P0
Input read circuit