HD64F2638F20J Renesas Electronics America, HD64F2638F20J Datasheet - Page 487

• Manufacturer Part Number: HD64F2638F20J
• Description: IC H8S MCU FLASH 256K 128-QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2600r

Specifications of HD64F2638F20J

• Core Processor: H8S/2600
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: CAN, SCI, SmartCard
• Peripherals: Motor Control PWM, POR, PWM, WDT
• Number Of I /o: 72
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 12x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 128-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

H8S/2639, H8S/2638, H8S/2636,
H8S/2630, H8S/2635 Group
Bit 5—Reset Select (RSTS): Selects the type of internal reset generated if TCNT overflows
during watchdog timer operation.
For details of the types of reset, see section 4, Exception Handling.
Bit 5
RSTS
0
1
Bits 4 to 0—Reserved: Always read as 1 and cannot be modified.
12.2.4
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.
Writing to TCNT and TCSR: These registers must be written to by a word transfer instruction.
They cannot be written to with byte instructions.
Figure 12-2 shows the format of data written to TCNT and TCSR. TCNT and TCSR both have the
same write address. For a write to TCNT, the upper byte of the written word must contain H'5A
and the lower byte must contain the write data. For a write to TCSR, the upper byte of the written
word must contain H'A5 and the lower byte must contain the write data. This transfers the write
data from the lower byte to TCNT or TCSR.
REJ09B0103-0800 Rev. 8.00
May 28, 2010
TCNT write
TCSR write
Notes on Register Access
Description
Reset
Do not set
Address: H'FF74
Address: H'FF74
Figure 12-2 Format of Data Written to TCNT and TCSR (WDT0)
15
15
H'5A
H'A5
8 7
8 7
Write data
Write data
Section 12 Watchdog Timer
Page 437 of 1458
(Initial value)
0
0