D6417709SHF200BV Renesas Electronics America, D6417709SHF200BV Datasheet - Page 263

• Manufacturer Part Number: D6417709SHF200BV
• Description: IC SUPER H MPU ROMLESS 208LQFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7700r

Specifications of D6417709SHF200BV

• Core Processor: SH-3
• 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: 16K 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: -

Note: If bits CKS2–CKS0 are modified when the WDT is running, the up-count may not be
9.7.3
The watchdog timer counter (WTCNT) and watchdog timer control/status register (WTCSR) are
more difficult to write to than other registers. The procedure for writing to these registers is given
below.
Writing to WTCNT and WTCSR: These registers must be written to using a word transfer
instruction. They cannot be written to with a byte or longword transfer instruction. When writing
to WTCNT, set the upper byte to H'5A and transfer the lower byte as the write data, as shown in
figure 9.3. When writing to WTCSR, set the upper byte to H'A5 and transfer the lower byte as the
write data. This transfer procedure writes the lower byte data to WTCNT or WTCSR.
Bit 2: CKS2
0
1
WTCNT write
WTCSR write
Address: H'FFFFFF84
Address: H'FFFFFF86
performed correctly. Ensure that these bits are modified only when the WDT is not running.
Notes on Register Access
0
1
0
1
Bit 1: CKS1
Figure 9.3 Writing to WTCNT and WTCSR
15
15
Bit 0: CKS0
0
1
0
1
0
1
0
1
H'5A
H'A5
Clock Division Ratio
1
1/4
1/16
1/32
1/64
1/256
1/1024
1/4096
(Initial value)
8
8
7
7
Rev. 5.00, 09/03, page 217 of 760
Overflow Period
(when P = 15 MHz)
17 s
68 s
273 s
546 s
1.09 ms
4.36 ms
17.48 ms
69.91 ms
Write data
Write data
0
0