HD64F2218TF24 Renesas Electronics America, HD64F2218TF24 Datasheet - Page 415

• Manufacturer Part Number: HD64F2218TF24
• Description: IC H8S MCU FLASH 128K 100-TQFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2200r

Specifications of HD64F2218TF24

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 24MHz
• Connectivity: SCI, SmartCard, USB
• Peripherals: DMA, POR, PWM, WDT
• Number Of I /o: 69
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 12K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Data Converters: A/D 6x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 100-TQFP, 100-VQFP
• For Use With: 3DK2218-SS - KIT DEV H8S/2218 WINDOWS SIDESHW
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

11.4.2
When the seconds, minutes, hours, or day-of-week datum is updated while time data is being read,
the data obtained may not be correct, and so the time data must be read again. Figure 11.4 shows
an example in which correct data is not obtained. In this example, since only RSECDR is read
after data update, about 1-minute inconsistency occurs.
To avoid reading in this timing, the following processing must be performed.
1. Check the setting of the BSY bit, and when the BSY bit changes from 1 to 0, read from the
2. Making use of interrupts, read from the second, minute, hour, and day-of week registers after
3. Read from the second, minute, hour, and day-of week registers twice in a row, and if there is
second, minute, hour, and day-of-week registers. When about 62.5 ms is passed after the BSY
bit is set to 1, the registers are updated, and the BSY bit is cleared to 0.
the IRQ5F flag in ISR is set to 1 and the BSY bit is confirmed to be 0.
no change in the read data, the read data is used.
Time Data Reading Procedure
Figure 11.4 Example: Reading of Inaccurate Time Data
Before update
After update
BSY bit = 0
BSY bit -> 1 (under data update)
BSY bit -> 0
(1) Day-of-week data register read H'03
(2) Hour data register read
(3) Minute data register read
(4) Second data register read
RWKDR = H'03, RHDDR = H'13, RMINDR = H'47, RSECDR = H'00
RWKDR = H'03, RHDDR = H'13, RMINDR = H'46, RSECDR = H'59
H'00
H'13
H'46
Rev.7.00 Dec. 24, 2008 Page 359 of 698
REJ09B0074-0700