DF3052BX25V Renesas Electronics America, DF3052BX25V Datasheet - Page 459

• Manufacturer Part Number: DF3052BX25V
• Description: MCU 5V 512K 100-TQFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8/300Hr

Specifications of DF3052BX25V

• Core Processor: H8/300H
• Core Size: 16-Bit
• Speed: 25MHz
• Connectivity: SCI, SmartCard
• Peripherals: DMA, POR, PWM, WDT
• Number Of I /o: 70
• Program Memory Size: 512KB (512K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 8x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 100-TQFP, 100-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

Bit 6—Reserved: Do not set to 1.
Bits 5 to 0—Reserved: Read-only bits, always read as 1.
12.2.4
The watchdog timer’s TCNT, TCSR, and RSTCSR registers differ from other registers in being
more difficult to write. The procedures for writing and reading these registers are given below.
Writing to TCNT and TCSR: These registers must be written by a word transfer instruction.
They cannot be written by byte instructions. Figure 12.2 shows the format of data written to TCNT
and TCSR. TCNT and TCSR both have the same write address. The write data must be contained
in the lower byte of the written word. The upper byte must contain H'5A (password for TCNT) or
H'A5 (password for TCSR). This transfers the write data from the lower byte to TCNT or TCSR.
Writing to RSTCSR: RSTCSR must be written by a word transfer instruction. It cannot be
written by byte transfer instructions. Figure 12.3 shows the format of data written to RSTCSR. To
write 0 in the WRST bit, the write data must have H'A5 in the upper byte and H'00 in the lower
byte. The H'00 in the lower byte clears the WRST bit in RSTCSR to 0.
TCNT write
TCSR write
Note:
Writing 0 in WRST bit
Note:
Notes on Register Access
Address
Address
Address
*
*
Lower 16 bits of the address.
Lower 16 bits of the address.
Figure 12.2 Format of Data Written to TCNT and TCSR
Figure 12.3 Format of Data Written to RSTCSR
H'FFA8*
H'FFA8*
H'FFAA*
15
15
15
H'5A
H'A5
H'A5
Rev. 3.00 Mar 21, 2006 page 429 of 814
8 7
8 7
8 7
Section 12 Watchdog Timer
Write data
Write data
H'00
REJ09B0302-0300
0
0
0