HD6417708SF60 Renesas Electronics America, HD6417708SF60 Datasheet - Page 203

• Manufacturer Part Number: HD6417708SF60
• Description: IC SUPERH MPU ROMLESS 144LQFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7700r

Specifications of HD6417708SF60

• Core Processor: SH-2
• Core Size: 32-Bit
• Speed: 60MHz
• Connectivity: EBI/EMI, SCI, SmartCard
• Peripherals: POR, WDT
• Number Of I /o: 8
• Program Memory Type: ROMless
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Oscillator Type: External
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 144-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Ram Size: -
• Program Memory Size: -
• Data Converters: -

9.10.5
WTCNT should be set as shown below when using the WDT of the SH7708 (not including the
SH7708S and SH7708R) in watchdog timer mode or interval timer mode.
WTNCT instruction
SLEEP instruction
WTCNT setting
WTCNT setting
set value + 1?
set value + 1?
WTCNT =
WTCNT =
Usage Notes
(a)
(a)
Yes
Yes
Figure 9.7 To Perform Repeated WTCNT Settings
Figure 9.6 To Operate the WDT in Sleep Mode
No
No
WTCNT instruction
count clock cycles
count clock cycles
SLEEP instruction
WTCNT setting
Wait for 2 WDT
WTCNT setting
Wait for 2 WDT
(b)
(b)
Perform either processing (a) or
processing (b). No processing is
required when the WDT is not used
(WTCSR.TME = 0). If this
processing is not performed, the
second WTCNT setting may not be
carried out.
(a)
(b)
Perform either processing (a) or
processing (b). No processing is
required when the WDT is not used
(WTCSR.TME = 0). If this
processing is not performed, the
WDT count will stop in sleep mode.
(a) Read WTCNT and confirm that
(b) Wait for two WDT count clock
After the first WTCNT setting,
read WTCNT and confirm that it
has been incremented, then
perform the next WTCNT
setting.
After the first WTCNT setting,
wait for two WDT count clock
it has been incremented, then
execute a SLEEP instruction.
cycles after WTCNT is set, then
execute a SLEEP instruction.
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