UPD78F1142AGB-GAH-AX Renesas Electronics America, UPD78F1142AGB-GAH-AX Datasheet - Page 289
UPD78F1142AGB-GAH-AX
Manufacturer Part Number
UPD78F1142AGB-GAH-AX
Description
MCU 16BIT 78K0R/KX3 64-LQFP
Manufacturer
Renesas Electronics America
Series
78K0R/Kx3r
Datasheet
1.UPD78F1142AGA-HAB-AX.pdf
(880 pages)
Specifications of UPD78F1142AGB-GAH-AX
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
-
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Company:
Part Number:
UPD78F1142AGB-GAH-AX
Manufacturer:
Renesas Electronics America
Quantity:
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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
287
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