UPD78F0551MA-FAA-AX Renesas Electronics America, UPD78F0551MA-FAA-AX Datasheet - Page 408

• Manufacturer Part Number: UPD78F0551MA-FAA-AX
• Description: MCU 8BIT 16-SSOP
• Manufacturer: Renesas Electronics America
• Series: 78K0/Kx2-Lr

Specifications of UPD78F0551MA-FAA-AX

• Core Processor: 78K/0
• Core Size: 8-Bit
• Speed: 10MHz
• Connectivity: I²C, LIN, UART/USART
• Peripherals: LVD, POR, PWM, WDT
• Number Of I /o: 9
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

78K0/Kx2-L
R01UH0028EJ0400 Rev.4.00
Sep 27, 2010
Example of correcting from 32772.3 Hz to 32768 Hz (32772.3 Hz − 131.2 ppm)
[Measuring the oscillation frequency]
outputting about 1 Hz from the RTC1HZ pin when the watch error correction register is set to its initial value (00H).
Note Refer to 10.4.5 1 Hz output of real-time counter for the setting procedure of outputting about 1 Hz from the
[Calculating the correction value]
−63.1 ppm or less, so assume DEV to be 0.
[Calculating the values to be set to (F6 to F0)]
Correction example <1>
The oscillation frequency
(When the output frequency from the RTCCL pin is 32772.3 Hz)
If the target frequency is assumed to be 32768 Hz (32772.3 Hz − 131.2 ppm), the correction range for −131.2 ppm is
The expression for calculating the correction value when DEV is 0 is applied.
(When the correction value is 86)
If the correction value is 0 or more (when delaying), assume F6 to be 0.
Calculate (F5, F4, F3, F2, F1, F0) from the correction value.
Consequently, when correcting from 32772.3 Hz to 32768 Hz (32772.3 Hz − 131.2 ppm), setting the correction
register such that DEV is 0 and the correction value is 86 (bits 6 to 0 of SUBCUD: 0101100) results in 32768 Hz (0
ppm).
Figure 10-27 shows the operation when (DEV, F6, F5, F4, F3, F2, F1, F0) is (0, 0, 1, 0, 1, 1, 0, 0).
RTC1HZ pin, and 10.4.6 32.768 kHz output of real-time counter for the setting procedure of outputting about
32 kHz from the RTCCL pin.
Correction value = Number of correction counts in 1 minute ÷ 3
{ (F5, F4, F3, F2, F1, F0) − 1}
(F5, F4, F3, F2, F1, F0)
(F5, F4, F3, F2, F1, F0)
Note
= (Oscillation frequency ÷ Target frequency − 1)
= (32772.3 ÷ 32768 − 1)
= 86
of each product is measured by outputting about 32 kHz from the RTCCL pin or
2
= 86
= 44
= (1, 0, 1, 1, 0, 0)
32768
60 ÷ 3
CHAPTER 10 REAL-TIME COUNTER
32768
60 ÷ 3
394