UPD78F1146AGB-GAH-AX Renesas Electronics America, UPD78F1146AGB-GAH-AX Datasheet - Page 277

• Manufacturer Part Number: UPD78F1146AGB-GAH-AX
• Description: MCU 16BIT 78K0R/KX3 64-LQFP
• Manufacturer: Renesas Electronics America
• Series: 78K0R/Kx3r

Specifications of UPD78F1146AGB-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: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 12K 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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Address: FFF99H
SUBCUD
(13) Watch error correction register (SUBCUD)
Symbol
Remark Set DEV to 0 when the correction range is −63.1 ppm or less, or 63.1 ppm or more.
This register is used to correct the watch with high accuracy when it is slow or fast by changing the value
(reference value: 7FFFH) that overflows from the sub-count register (RSUBC) to the second count register.
SUBCUD can be set by an 8-bit memory manipulation instruction.
Reset signal generation clears this register to 00H.
The range of value that can be corrected by using the watch error correction register (SUBCUD) is shown
below.
Writing to the SUBCUD register at the following timing is prohibited.
When (F6, F5, F4, F3, F2, F1, F0) = (*, 0, 0, 0, 0, 0, *), the watch error is not corrected. * is 0 or 1.
/F5 to /F0 are the inverted values of the corresponding bits (000011 when 111100).
Range of correction value: (when F6 = 0) 2, 4, 6, 8, … , 120, 122, 124
Correctable range
Maximum excludes
quantization error
Minimum resolution
• When DEV = 0 is set: For a period of SEC = 00H, 20H, 40H
• When DEV = 1 is set: For a period of SEC = 00H
DEV
DEV
F6
7
0
1
0
1
After reset: 00H
Figure 7-14. Format of Watch Error Correction Register (SUBCUD)
Corrects watch error when the second digits are at 00, 20, or 40 (every 20 seconds).
Corrects watch error only when the second digits are at 00 (every 60 seconds).
Increases by {(F5, F4, F3, F2, F1, F0) – 1} × 2.
Decreases by {(/F5, /F4, /F3, /F2, /F1, /F0) + 1} × 2.
F6
6
–189.2 ppm to 189.2 ppm
±1.53 ppm
±3.05 ppm
R/W
DEV = 0 (correction every 20 seconds)
(when F6 = 1) –2, –4, –6, –8, … , –120, –122, –124
CHAPTER 7 REAL-TIME COUNTER
F5
5
User’s Manual U17854EJ9V0UD
Setting of watch error correction timing
Setting of watch error correction value
F4
4
F3
3
–63.1 ppm to 63.1 ppm
±0.51 ppm
±1.02 ppm
DEV = 1 (correction every 60 seconds)
F2
2
F1
1
F0
0
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