HD6417751RF240V Renesas Electronics America, HD6417751RF240V Datasheet - Page 384

• Manufacturer Part Number: HD6417751RF240V
• Description: MPU 1.5/3.3V 0K PB-FREE 256-QFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7750r

Specifications of HD6417751RF240V

• Core Processor: SH-4
• Core Size: 32-Bit
• Speed: 240MHz
• Connectivity: EBI/EMI, FIFO, SCI, SmartCard
• Peripherals: DMA, POR, WDT
• Number Of I /o: 39
• Program Memory Type: ROMless
• Ram Size: 48K x 8
• Voltage - Supply (vcc/vdd): 1.4 V ~ 1.6 V
• Oscillator Type: External
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 256-QFP Exposed Pad, 256-eQFP, 256-HQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -

10. Clock Oscillation Circuits
10.8.3
The watchdog timer counter (WTCNT) and watchdog timer control/status register (WTCSR)
differ from other registers in being more difficult to write to. The procedure for writing to these
registers is given below.
Writing to WTCNT and WTCSR: These registers must be written to with a word transfer
instruction. They cannot be written to with a byte or longword transfer instruction. When writing
to WTCNT, perform the transfer with the upper byte set to H'5A and the lower byte containing the
write data. When writing to WTCSR, perform the transfer with the upper byte set to H'A5 and the
lower byte containing the write data. This transfer procedure writes the lower byte data to
WTCNT or WTCSR. The write formats are shown in figure 10.3.
Rev.4.00 Oct. 10, 2008 Page 284 of 1122
REJ09B0370-0400
WTCNT write
WTCSR write
Address: H'FFC0000C
Address: H'FFC00008
Notes on Register Access
(H'1FC0000C)
(H'1FC00008)
Figure 10.3 Writing to WTCNT and WTCSR
15
15
H'5A
H'A5
8
8
7
7
Write data
Write data
0
0