HD6417712BPV Renesas Electronics America, HD6417712BPV Datasheet - Page 370

• Manufacturer Part Number: HD6417712BPV
• Description: MPU 1.5/3.3V 0K PB-FREE 256-BGA
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH Ethernetr

Specifications of HD6417712BPV

• Core Processor: SH-3 DSP
• Core Size: 32-Bit
• Speed: 200MHz
• Connectivity: EBI/EMI, Ethernet, FIFO, SCI, SIO
• Peripherals: DMA, POR, WDT
• Number Of I /o: 24
• Program Memory Type: ROMless
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 1.4 V ~ 1.6 V
• Oscillator Type: External
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 256-BGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -

Section 11 On-Chip Oscillation Circuits
11.7.3
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 are given
below.
Writing to WTCNT and WTCSR: These registers must be written by a word transfer
instruction. They cannot be written by 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 11.3. 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.
Rev. 1.00 Dec. 27, 2005 Page 326 of 932
REJ09B0269-0100
Bit
2
1
0
Notes on Register Access
Bit Name
CKS2
CKS1
CKS0
Initial
Value
0
0
0
R/W
R/W
R/W
R/W
Description
Clock Select 2 to 0
These bits select the clock to be used for the WTCNT
count from the eight types obtainable by dividing the
peripheral clock. The overflow period in the table is
the value when the peripheral clock (Pφ) is 15 MHz.
Note: If bits CKS2 to CKS0 are modified when the
WDT is running, the up-count may not be
performed correctly. Ensure that these bits
are modified only when the WDT is not
running.
Select
Clock
000
001
010
011
100
101
110
111
Division Ratio (when P =15MHz)
1
1/4
1/16
1/32
1/64
1/256
1/1024
1/4096
Clock
Overflow Period
17.48 ms
69.91 ms
1.09 ms
4.36 ms
273 s
546 s
17 s
68 s