UPD70F3738GF-GAS-AX Renesas Electronics America, UPD70F3738GF-GAS-AX Datasheet - Page 487

• Manufacturer Part Number: UPD70F3738GF-GAS-AX
• Description: MCU 32BIT V850ES/JX3-L 100-LQFP
• Manufacturer: Renesas Electronics America
• Series: V850ES/Jx3-Lr

Specifications of UPD70F3738GF-GAS-AX

• Core Processor: RISC
• Core Size: 32-Bit
• Speed: 20MHz
• Connectivity: CSI, EBI/EMI, I²C, UART/USART
• Peripherals: DMA, LVD, PWM, WDT
• Number Of I /o: 84
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 2.2 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: -

11.4.9 Watch error correction example of real-time counter
μ
resonator has been connected when designing the system, and the RC1SUBC and RC1SEC count operations to
correct the error are shown below.
PD70F3792, 70F3793.
(32.768 kHz)
(32.769 kHz)
(32.769 kHz)
The watch error correction function corrects deviation in the oscillation frequency of a resonator connected to the
Deviation, here, refers to steady-state deviation, which is deviation in the frequency when the resonator is designed.
Next, the timing chart when an error has occurred in the input clock intended to be 32.768 kHz but a 32.769 kHz
Notes 1. One second is counted by counting 32,768 (0000H to 7FFFH) with a 32.768 kHz clock.
RC1SUBC
RC1SUBC
RC1SUBC
RC1SEC
RC1SEC
RC1SEC
RTCCLK
RTCCLK
RTCCLK
2. Counting 32,768 (0000H to 7FFFH) with a 32.770 kHz clock results in 32,768/32,770 = 0.999939
3. With a 32.770 kHz clock, by counting to 32,770 (0000H to 8001H), one second can be counted
seconds.
Where an error of (32,768/32,770 − 1) × 60 (seconds) × 60 (minutes) × 24 (hours) × 30 (days) =
−158.2 seconds occurs per month.
without an error occurring.
7FFEH 7FFFH 0000H 0001H 0002H 0003H 0004H 0005H
7FFEH 7FFFH 0000H 0001H 0002H 0003H 0004H 0005H
7FFEH 7FFFH 0000H 0001H 0002H 0003H 0004H 0005H
00
00
00
CHAPTER 11 REAL-TIME COUNTER (
Figure 11-10. Watch Error Correction Example
(32.769 kHz/no 0.002 error correction)
0.999939 seconds
User’s Manual U18953EJ5V0UD
(32.769 kHz/0.002 error correction)
Watch count (32.768 kHz)
1 second
Watch count
Watch count
1 second
01
01
01
Note 1
PD70F3792, 70F3793)
7FFEH 7FFFH 0000H 0001H 0002H 0003H 0004H
7FFEH 7FFFH 8000H 8001H 0000H 0001H 0002H
7FFDH 7FFEH 7FFFH 0000H 0001H 0002H 0003H
2 count numbers are added.
Note 3
Note 2
02
02
02
485