M3087BFLBGP#U5 Renesas Electronics America, M3087BFLBGP#U5 Datasheet - Page 82

• Manufacturer Part Number: M3087BFLBGP#U5
• Description: IC M32C/87 MCU FLASH 144LQFP
• Manufacturer: Renesas Electronics America
• Series: M16C™ M32C/80r

Specifications of M3087BFLBGP#U5

• Core Processor: M32C/80
• Core Size: 16/32-Bit
• Speed: 32MHz
• Connectivity: EBI/EMI, I²C, IEBus, IrDA, SIO, UART/USART
• Peripherals: DMA, POR, PWM, WDT
• Number Of I /o: 121
• Program Memory Size: 1MB (1M x 8)
• Program Memory Type: FLASH
• Ram Size: 48K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Data Converters: A/D 34x10b, D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 144-LQFP
• For Use With: R0K330879S001BE - KIT DEV RSK M32C/87R0K330879S000BE - KIT DEV RSK M32C/87
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

M32C/87 Group (M32C/87, M32C/87A, M32C/87B)
REJ09B0180-0151 Rev.1.51 Jul 31, 2008
Page 58 of 587
6.3
Figure 6.7
6.2.1
The WDC5 bit in the WDC register determines whether it is a reset process when power-on (cold start) or a reset
process when the RESET signal is input during MCU running (warm start). Default value of the WDC5 bit is 0
(cold start) when power-on, and the bit is set to 1 (warm start) by writing given values to the WDC register. The
WDC5 bit does not become 0 even if the hardware reset 1, hardware reset 2, software reset, or watchdog timer reset
is performed.
Figure 6.7 shows an example of cold start/warm start determination function operation.
WDC5 bit
When all the conditions below are met, the Vdet4 detection interrupt is generated and the MCU exits wait mode
as soon as the WAIT instruction is executed or exits stop mode as soon as the CM10 bit in the CM1 register is
set to 1 (all clocks stopped).
Execute the WAIT instruction or set the CM10 bit to 1 (all clocks stop) while the VC13 bit is 0
(VCC1 < Vdet4), if the MCU is configured to enter wait/stop mode when voltage applied to the VCC1 pin
drops Vdet4 or below and to exit wait/stop mode when the voltage applied rises to Vdet4 or above.
If the Vdet4 detection interrupt has been used to exit wait mode or stop mode, set the D41 bit to 0 and then set it
back to 1 to use the Vdet4 detection interrupt again to exit wait/stop mode.
RESET
VCC1
Cold Start/Warm Start Determination Function
•
•
•
•
the VC27 bit in the VCR2 register is set to 1 (Vdet4 detection function used)
the D40 bit in the D4INT register is set to 1 (Vdet4 detection interrupt enabled)
the D41 bit in the D4INT register is set to 1 (Vdet4 detection interrupt is used to exit wait/stop mode)
the voltage applied to the VCC1 pin is Vdet4 or above (the VC13 bit in the VCR1 register is 1)
Usage Notes on Vdet4 Detection Interrupt
5 V
0 V
5 V
0 V
1
0
NOTE:
Cold Start/Warm Start Determination Function Operation
1. If the time difference between T1 and T2 is greater, it may take longer to set the WDC5 bit to 1.
Reset sequence (Approx.20 μ s@16 MHz)
T1
T2
Pch transistor ON (Approx. 4 V)
CPU comes out of reset
T > 100 μ s
Program starts running
Set to 1 by a program
The WDC5 bit remains set
to 1 even if voltage applied
to RESET becomes 0 V.
6. Power Supply Voltage Detection Function