DF3048BVX25V Renesas Electronics America, DF3048BVX25V Datasheet - Page 475

• Manufacturer Part Number: DF3048BVX25V
• Description: MCU 3/5V 128K PB-FREE 100-TQFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8/300Hr

Specifications of DF3048BVX25V

• Core Processor: H8/300H
• Core Size: 16-Bit
• Speed: 25MHz
• Connectivity: SCI, SmartCard
• Peripherals: DMA, PWM, WDT
• Number Of I /o: 70
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 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—Reset Output Enable (RSTOE): Enables or disables external output at the RESO pin of
the reset signal generated if TCNT overflows during watchdog timer operation. Note that there is
no RESO pin in the versions with on-chip flash memory.
Bits 5 to 0—Reserved: These bits cannot be modified and are 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.
Bit 6
RSTOE
0
1
TCNT write
TCSR write
Note: * Lower 16 bits of the address.
Notes on Register Rewriting
Address
Address
Description
Reset signal is not output externally
Reset signal is output externally
Figure 12.2 Format of Data Written to TCNT and TCSR
H'FFA8 *
H'FFA8 *
15
15
H'5A
H'A5
Rev. 3.00 Sep 27, 2006 page 447 of 872
8 7
8 7
Section 12 Watchdog Timer
Write data
Write data
REJ09B0325-0300
(Initial value)
0
0