UPD70F3771GF-GAT-AX Renesas Electronics America, UPD70F3771GF-GAT-AX Datasheet - Page 663

• Manufacturer Part Number: UPD70F3771GF-GAT-AX
• Description: MCU 32BIT V850ES/JX3-H 128-LQFP
• Manufacturer: Renesas Electronics America
• Series: V850ES/Jx3-Hr

Specifications of UPD70F3771GF-GAT-AX

• Core Processor: RISC
• Core Size: 32-Bit
• Speed: 48MHz
• Connectivity: CAN, CSI, EBI/EMI, I²C, UART/USART, USB
• Peripherals: DMA, LVD, PWM, WDT
• Number Of I /o: 96
• Program Memory Size: 256KB (256K 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: -

<R>
V850ES/JG3-H, V850ES/JH3-H
12.4.9 Watch error correction example of real-time counter
V850ES/Jx3-H.
resonator has been connected when designing the system, and the RC1SUBC and RC1SEC count operations to correct
the error are shown below.
R01UH0042EJ0400 Rev.4.00
Sep 30, 2010
(32.7681 kHz)
(32.7681 kHz)
(32.768 kHz)
RC1SUBC
RC1SUBC
RC1SUBC
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 32.7681 kHz
Notes 1. The RC1SEC counter counts 20 seconds every 32,768 cycles (0000H to 7FFFH) of the 32.768 kHz
RTCCLK
RC1SEC
RTCCLK
RC1SEC
RTCCLK
RC1SEC
2. When 32,768 cycles (0000H to 7FFFH) of the 32.7681 kHz clock are input, the time counted by the
3. To precisely count 20 seconds by using a 32.7681 kHz clock, clear the DEV and F6 bits to 0 and set the
clock.
RC1SEC counter is calculated as follows: 32,768/3,268.1 ≅ 0.999997 seconds
If this counting continues 20 times, the time is calculated as follows: (32,768/32,768.1) x 20 ≅ 19.99994
seconds, which causes an error of 0.00006 seconds.
F5 to F0 bits to 2H (000010B) in the RC1SUBU register. As a result, two additional cycles are counted
every 20 seconds (when the RC1SEC counter count is 00, 20, and 40 seconds), so that the number of
cycles counted at these points is not 32,768, but 32,770 (0000H to 8001H), which is exactly 20 seconds.
0000H
0000H
0000H
00
00
(32.7681
7FFFH 8000H 8001H
7FFFH
00
2 count numbers are added.
7FFFH
0000H
Figure 12-10. Watch Error Correction Example
0000H
kHz/error
01
01
correction(DEV bit = 0, F6 bit = 0, F5 to F0 bit = 000010))
7FFFH
0000H
7FFFH
(32.7681
19.99994
0000H
01
0000H
Watch count
20
20
Watch
kHz/no error
7FFFH 0000H
Watch count
seconds
seconds
seconds
count(32.768 kHz)
Note 2
Note 3
Note 1
correction)
7FFFH
7FFFH 0000H
7FFFH
0000H
CHAPTER 12 REAL-TIME COUNTER
0000H
19
19
19
7FFFH
7FFFH
7FFFH
0000H
0000H
20
2 count numbers are added.
20
7FFFH
20
Page 663 of 1509
7FFFH
8000H 8001H