HD64F7051SFJ20V Renesas Electronics America, HD64F7051SFJ20V Datasheet - Page 388

• Manufacturer Part Number: HD64F7051SFJ20V
• Description: MCU 5V 256K J-TEMP PB-FREE QFP-1
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7050r

Specifications of HD64F7051SFJ20V

• Core Processor: SH-2
• Core Size: 32-Bit
• Speed: 20MHz
• Connectivity: EBI/EMI, SCI
• Peripherals: DMA, WDT
• Number Of I /o: 102
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 10K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 16x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 168-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

Section 12 Watchdog Timer (WDT)
12.4
12.4.1
If a timer counter increment clock pulse is generated during the T
TCNT, the write takes priority and the timer counter is not incremented (figure 12.8).
12.4.2
If the values of bits CKS2 to CKS0 are altered while the WDT is running, the count may
increment incorrectly. Always stop the watchdog timer (by clearing the TME bit to 0) before
changing the values of bits CKS2 to CKS0.
12.4.3
To prevent incorrect operation, always stop the watchdog timer (by clearing the TME bit to 0)
before switching between interval timer mode and watchdog timer mode.
Rev. 5.00 Jan 06, 2006 page 366 of 818
REJ09B0273-0500
Notes on Use
TCNT Write and Increment Contention
Changing CKS2 to CKS0 Bit Values
Changing between Watchdog Timer/Interval Timer Modes
write signal
input clock
Address
Internal
Figure 12.8 Contention between TCNT Write and Increment
TCNT
TCNT
CK
T
1
TCNT write cycle
TCNT address
N
T
2
Counter write data
T
3
3
state of a write cycle to the
M