UPD70F3740GC-UEU-AX Renesas Electronics America, UPD70F3740GC-UEU-AX Datasheet - Page 407

• Manufacturer Part Number: UPD70F3740GC-UEU-AX
• Description: MCU 32BIT V850ES/JX3 100-LQFP
• Manufacturer: Renesas Electronics America
• Series: V850ES/Jx3r

Specifications of UPD70F3740GC-UEU-AX

• Core Processor: RISC
• Core Size: 32-Bit
• Speed: 32MHz
• Connectivity: CSI, EBI/EMI, I²C, UART/USART
• Peripherals: DMA, LVD, PWM, WDT
• Number Of I /o: 84
• Program Memory Size: 512KB (512K x 8)
• Program Memory Type: FLASH
• Ram Size: 40K x 8
• Voltage - Supply (vcc/vdd): 2.85 V ~ 3.6 V
• Data Converters: A/D 12x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

V850ES/JG3
10.4 Operation
10.4.1 Operation as watch timer
time intervals of 0.25 or 0.5 seconds with the subclock (32.768 kHz) or main clock.
0, the 11-bit prescaler and 5-bit counter are cleared and the count operation stops.
the same time as the interval timer. At this time, an error of up to 15.6 ms may occur for the watch timer, but the interval
timer is not affected.
BGCS00 bits, the 8-bit comparison value using the PRSCM0 register, and the count clock frequency (f
timer to 32.768 kHz.
register.
R01UH0015EJ0300 Rev.3.00
Sep 30, 2010
The watch timer generates an interrupt request signal (INTWT) at fixed time intervals. The watch timer operates using
The count operation starts when the WTM.WTM1 and WTM.WTM0 bits are set to 11. When the WTM0 bit is cleared to
The time of the watch timer can be adjusted by clearing the WTM1 bit to 0 and then the 5-bit counter when operating at
If the main clock is used as the count clock of the watch timer, set the count clock using the PRSM0.BGCS01 and
When the PRSM0.BGCE0 bit is set (1), f
f
To set f
<1> Set N = f
<2> When the value resulting from rounding up the first decimal place of N is even, set N before the roundup as N/2
<3> Repeat <2> until N is odd or m = 3.
<4> Set the value resulting from rounding up the first decimal place of N to the PRSCM0 register and m to the BGCS01
Example: When f
Remark m: Division value (set value of BGCS01 and BGCS00 bits) = 0 to 3
BRG
f
BRG
can be calculated by the following expression.
and m as m + 1.
and BGCS00 bits.
= f
BRG
X
N: Set value of PRSCM0 register = 1 to 256
f
/(2
<1> N = 4,000,000/65,536 = 61.03…, m = 0
<2>, <3> Because N (round up the first decimal place) is odd, N = 61, m = 0.
<4> Set value of PRSCM0 register: 3DH (61), set value of BGCS01 and BGCS00 bits: 00
At this time, the actual f
f
X
to 32.768 kHz, perform the following calculation and set the BGCS01 and BGCS00 bits and the PRSCM0
BRG
: Main clock oscillation frequency
X
However, N = 256 only when PRSCM0 register is set to 00H.
m+1
/65,536. Set m = 0.
= f
= 32.787 kHz
× N)
X
X
/(2
= 4.00 MHz
m+1
× N) = 4,000,000/(2 × 61)
BRG
frequency is as follows.
BRG
is supplied to the watch timer.
CHAPTER 10 WATCH TIMER FUNCTIONS
BRG
Page 391 of 870
) of the watch