UPD78F1142AF1-BA4-A Renesas Electronics America, UPD78F1142AF1-BA4-A Datasheet - Page 289

• Manufacturer Part Number: UPD78F1142AF1-BA4-A
• Description: MCU 16BIT 78K0R/KX3 64-FBGA
• Manufacturer: Renesas Electronics America
• Series: 78K0R/Kx3r

Specifications of UPD78F1142AF1-BA4-A

• Core Processor: 78K/0R
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: 3-Wire SIO, I²C, LIN, UART/USART
• Peripherals: DMA, LVD, POR, PWM, WDT
• Number Of I /o: 50
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: FLASH
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

Example of correcting from 32767.4 Hz to 32768 Hz (32767.4 Hz + 18.3 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 See 7.4.5 1 Hz output of real-time counter for the setting procedure of outputting about 1 Hz from the
[Calculating the correction value]
[Calculating the values to be set to (F6 to F0)]
Correction example <2>
The oscillation frequency
(When the output frequency from the RTCCL pin is 0.9999817 Hz)
Oscillation frequency = 32768
Assume the target frequency to be 32768 Hz (32767.4 Hz + 18.3 ppm) and DEV to be 1.
The expression for calculating the correction value when DEV is 1 is applied.
(When the correction value is −36)
If the correction value is 0 or less (when speeding up), assume F6 to be 1.
Calculate (F5, F4, F3, F2, F1, F0) from the correction value.
Consequently, when correcting from 32767.4 Hz to 32768 Hz (32767.4 Hz + 18.3 ppm), setting the correction
register such that DEV is 1 and the correction value is −36 (bits 6 to 0 of SUBCUD: 1101110) results in 32768
Hz (0 ppm).
Figure 7-28 shows the operation when (DEV, F6, F5, F4, F3, F2, F1, F0) is (1, 1, 1, 0, 1, 1, 1, 0).
RTC1HZ pin, and 7.4.6 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
− {(/F5, /F4, /F3, /F2, /F1, /F0) + 1}
(/F5, /F4, /F3, /F2, /F1, /F0)
(/F5, /F4, /F3, /F2, /F1, /F0)
(F5, F4, F3, F2, F1, F0)
Note
= (Oscillation frequency ÷ Target frequency − 1)
= (32767.4 ÷ 32768 − 1)
= −36
of each product is measured by outputting about 32 kHz from the RTCCL pin or
0.9999817 ≈ 32767.4 Hz
CHAPTER 7 REAL-TIME COUNTER
User’s Manual U17854EJ9V0UD
2
32768
= −36
= 17
= (0, 1, 0, 0, 0, 1)
= (1, 0, 1, 1, 1, 0)
60
32768
60
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