UPD78F0555MA-FAA-AX Renesas Electronics America, UPD78F0555MA-FAA-AX Datasheet - Page 397

• Manufacturer Part Number: UPD78F0555MA-FAA-AX
• Description: MCU 8BIT 16-SSOP
• Manufacturer: Renesas Electronics America
• Series: 78K0/Kx2-Lr

Specifications of UPD78F0555MA-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: 4KB (4K x 8)
• Program Memory Type: FLASH
• Ram Size: 384 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
Address: FFB9H
SUBCUD
(13) Watch error correction register (SUBCUD)
Symbol
Remark If a correctable range is –63.1 ppm or lower and 63.1 ppm or higher, set 0 to DEV.
This register is used to correct the watch with high accuracy when it is slow or fast by changing the value that
overflows from the sub-count register (RSUBC) to the second count register (reference value: 7FFFH).
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
After reset: 00H
0
1
0
1
7
Figure 10-14. 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
R/W
–189.2 ppm to 189.2 ppm
± 1.53 ppm
± 3.05 ppm
DEV = 0 (correction every 20 seconds)
(when F6 = 1) –2, –4, –6, –8, … , –120, –122, –124
F5
5
Setting of watch error correction timing
Setting of watch error correction value
F4
4
F3
3
CHAPTER 10 REAL-TIME COUNTER
–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
383