M3087BFLBGP#U5 Renesas Electronics America, M3087BFLBGP#U5 Datasheet - Page 80

• 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 56 of 587
6.2
Table 6.1
NOTES:
Table 6.2
NOTE:
CPU operating mode
Wait mode, Stop mode
CPU Clock
Vdet4 detection interrupt is generated if the voltage applied to the VCC1 pin crosses the Vdet4 (V) level, either by
dropping below or by rising above Vdet4. Set the VC27 bit in the VCR2 register to 1 (Vdet4 detection function
used) and the D40 bit in the D4INT register to 1 (Vdet4 detection interrupt enabled) to use the Vdet4 detection
function.
The D42 bit becomes 1 (voltage has crossed Vdet4) as soon as the applied voltage crosses Vdet4. When the D42 bit
changes from 0 to 1, a Vdet4 detection interrupt request is generated. The D42 bit does not become 0 automatically
when the interrupt is acknowledged. Set it to 0 (not detected) by a program. Whether the voltage has dropped below
Vdet4 or risen above Vdet4 can be determined by reading the VC13 bit in the VCR1 register.
Set the D41 bit in the D4INT register to 1 to use the Vdet4 detection interrupt to exit wait mode or stop mode. The
MCU exits wait mode or stop mode if the Vdet4 detection signal is generated even if the D42 bit is 1.
The Vdet4 detection interrupt shares the same interrupt vector with watchdog timer interrupt and oscillation stop
detection interrupt. When using the Vdet4 detection interrupt simultaneously with these interrupts, determine
whether the Vdet4 detection interrupt is generated by reading the D42 bit in the interrupt routine.
Table 6.1 shows conditions to generate Vdet4 detection interrupt request. Figure 6.6 shows a Vdet4 detection
function operation example.
Bits DF1 and DF0 in the D4INT register determine the sampling clock which is used to detects if the voltage
applied to the VCC1 pin has crossed Vdet4. Table 6.2 shows the sampling periods.
1. Set to 0 by a program before generating an interrupt.
2. An interrupt request is generated when the sampling period elapses after the value of the VC13 bit is changed.
3. CPU operating mode includes main clock mode, main clock direct mode, PLL mode, low speed mode, low-
4. Refer to 6.2.1 Usage Notes on Vdet4 Detection Interrupt.
1. Set the CPU clock 24 MHz or lower to use the voltage detection function.
(MHz)
16
24
Operating Mode
See Figure 6.6 Vdet4 Detection Function Operation Example for details.
power consumption mode, on-chip oscillator mode, on-chip oscillator low-power consumption mode. (Refer to
9. Clock Generation Circuits.)
Vdet4 Detection Function
Conditions to Generate Vdet4 Detection Interrupt Request
Sampling Periods
Divided-by-8
3.0
2.0
(3)
(4)
Divided-by-16
VC27 Bit
1
Sampling Clock (μs)
6.0
4.0
Divided-by-32
D40 Bit
1
12.0
8.0
Divided-by-64
D41 Bit
0 or 1
24.0
16.0
6. Power Supply Voltage Detection Function
1
D42 Bit
0 to 1
0 or 1
(1)
VC13 Bit
0 to 1
1 to 0
0 to 1
(2)