HD6417750RF240DV Renesas Electronics America, HD6417750RF240DV Datasheet - Page 420

• Manufacturer Part Number: HD6417750RF240DV
• Description: MPU 3V 16K I-TEMP,PB-FREE 208-QF
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7750r

Specifications of HD6417750RF240DV

• Core Processor: SH-4
• Core Size: 32-Bit
• Speed: 240MHz
• Connectivity: EBI/EMI, FIFO, SCI, SmartCard
• Peripherals: DMA, POR, WDT
• Number Of I /o: 28
• Program Memory Type: ROMless
• Ram Size: 48K x 8
• Voltage - Supply (vcc/vdd): 1.4 V ~ 1.6 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 208-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -

Section 11 Realtime Clock (RTC)
11.5.4
Description: When setting values are written to an RTC register, values may change in writable
RTC counter registers other than that to which the settings are written.
The RTC registers are R64CNT, RSECCNT, RMINCNT, RHRCNT, RWKCNT, RDAYCNT,
RMONCNT, RYRCNT, RSECAR, RMINAR, RHRAR, RDAYAR, RWKAR, RMONAR, RCR1,
and RCR2. Of these, RSECCNT, RMINCNT, RHRCNT, RWKCNT, RDAYCNT, RMONCNT,
and RYRCNT are writeable registers.
Workarounds: To avoid the problem, use one of methods 1. to 3. below to write settings to the
RTC registers.
Rev.7.00 Oct. 10, 2008 Page 334 of 1074
REJ09B0366-0700
Notes: 1. Select either the C
Noise filter
2. Built-in resistance value R
3. C
4. The crystal oscillation stabilization time depends on the mounted circuit constants, floating
5. Place the crystal resonator and load capacitors C
6. Ensure that the crystal resonator connection pin (EXTAL2 and XTAL2) wiring is routed as far away
7. Insert a noise filter in the RTC power supply.
RTC Register Settings (SH7750 only)
requirements such as the adjustment range, degree of stability, etc.
earth board.
capacitance, etc., and should be decided after consultation with the crystal resonator
manufacturer.
XTAL2 pins.)
as possible from other power lines (except GND) and signal lines.
(Correct oscillation may not be possible if there is externally induced noise in the EXTAL2 and
in
R
and C
RTC
VDD-RTC
Figure 11.5 Example of Crystal Oscillator Circuit Connection
3.3 V
out
values include floating capacitance due to the wiring. Take care when using a solid-
C
RTC
in
or C
out
f
(typ. value) = 10 MΩ, R
side for the frequency adjustment variable capacitor according to
VSS-RTC
SH7750R
SH7750S
SH7750
in
D
and C
(typ. value) = 400 kΩ
EXTAL2
C
in
out
as close as possible to the chip.
R
f
XTAL
XTAL2
R
D
C
out