R5F61668RN50FPV Renesas Electronics America, R5F61668RN50FPV Datasheet - Page 897

• Manufacturer Part Number: R5F61668RN50FPV
• Description: IC H8SX/1668 MCU FLASH 144LQFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8SX/1600r

Specifications of R5F61668RN50FPV

• Core Processor: H8SX
• Core Size: 16/32-Bit
• Speed: 50MHz
• Connectivity: EBI/EMI, I²C, IrDA, SCI, SmartCard, USB
• Peripherals: DMA, LVD, POR, PWM, WDT
• Number Of I /o: 92
• Program Memory Size: 1MB (1M x 8)
• Program Memory Type: FLASH
• Ram Size: 56K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 8x10b; D/A 2x8b
• Oscillator Type: External
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 144-LQFP
• For Use With: R0K561668S000BE - KIT STARTER FOR H8SX/1668R0K561664S001BE - KIT STARTER FOR H8SX/1651HS0005KCU11H - EMULATOR E10A-USB H8S(X),SH2(A)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

18.6
18.6.1
The watchdog timer's TCNT, TCSR, and RSTCSR registers differ from other registers in being
more difficult to write to. The procedures for writing to and reading these registers are given
below.
(1)
TCNT and TCSR must be written to by a word transfer instruction. They cannot be written to by a
byte transfer instruction.
For writing, TCNT and TCSR are assigned to the same address. Accordingly, perform data
transfer as shown in figure 18.4. The transfer instruction writes the lower byte data to TCNT or
TCSR.
To write to RSTCSR, execute a word transfer instruction for address H'FFA6. A byte transfer
instruction cannot be used to write to RSTCSR.
The method of writing 0 to the WOVF bit in RSTCSR differs from that of writing to the RSTE bit
in RSTCSR. Perform data transfer as shown in figure 18.4.
At data transfer, the transfer instruction clears the WOVF bit to 0, but has no effect on the RSTE
bit. To write to the RSTE bit, perform data transfer as shown in figure 18.4. In this case, the
transfer instruction writes the value in bit 6 of the lower byte to the RSTE bit, but has no effect on
the WOVF bit.
Writing to TCNT, TCSR, and RSTCSR
Usage Notes
Notes on Register Access
TCSR write:
Writing 0 to the WOVF bit in RSTCSR:
TCNT write or writing to the RSTE bit in RSTCSR:
Address: H'FFA4 (TCNT)
Address: H'FFA4 (TCSR)
Address: H'FFA6 (RSTCSR)
Figure 18.4 Writing to TCNT, TCSR, and RSTCSR
H'FFA6 (RSTCSR)
15
15
15
H'5A
H'A5
H'A5
Rev. 2.00 Sep. 24, 2008 Page 863 of 1468
8 7
8 7
8 7
Section 18 Watchdog Timer (WDT)
Write data
Write data
H'00
0
0
0
REJ09B0412-0200