D6417729RHF200BV Renesas Electronics America, D6417729RHF200BV Datasheet - Page 312

• Manufacturer Part Number: D6417729RHF200BV
• Description: IC SUPER H MPU ROMLESS 208QFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7700r

Specifications of D6417729RHF200BV

• Core Processor: SH-3 DSP
• Core Size: 32-Bit
• Speed: 200MHz
• Connectivity: EBI/EMI, FIFO, IrDA, SCI, SmartCard
• Peripherals: DMA, POR, WDT
• Number Of I /o: 96
• Program Memory Type: ROMless
• Ram Size: 32K x 8
• Voltage - Supply (vcc/vdd): 1.85 V ~ 2.15 V
• Data Converters: A/D 8x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 208-QFP Exposed Pad, 208-eQFP, 208-HQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -

10.8
10.8.1
The WDT can be used to cancel standby mode with an NMI or other interrupt. The procedure is
described below. (The WDT does not run when a reset is used for canceling, so keep the RESET
pin low until the clock stabilizes.)
1. Before transitioning to standby mode, always clear the TME bit in WTCSR to 0. When the
2. Set the type of count clock used in the CKS2–CKS0 bits in WTCSR and the initial values for
3. Switch to standby mode by executing a SLEEP instruction to stop the clock.
4. The WDT starts counting by detecting the edge change of the NMI signal or detecting
5. When the WDT count overflows, the CPG starts supplying the clock and the processor
6.
Rev. 5.0, 09/03, page 264 of 806
WTCNT write
WTCSR write
TME bit is 1, an erroneous reset or interval timer interrupt may be generated when the count
overflows.
the counter in the WTCNT counter. These values should ensure that the time till count
overflow is longer than the clock oscillation settling time.
interrupts.
resumes operation. The WOVF flag in WTCSR is not set when this happens.
Since the WDT continues counting from H'00, set the STBY bit in the STBCR register to 0 in
the interrupt handling routine and this will stop the WDT. When the STBY bit remains at 1,
the SH7729R again enters standby mode when the WDT has counted up to H'80. This standby
mode can be canceled by a power-on reset
Address: H'FFFFFF84
Address: H'FFFFFF86
Using the WDT
Canceling Standby
Figure 10.3 Writing to WTCNT and WTCSR
15
15
H'5A
H'A5
8
8
7
7
Write data
Write data
0
0