HD64F3644PV Renesas Electronics America, HD64F3644PV Datasheet - Page 296

• Manufacturer Part Number: HD64F3644PV
• Description: IC H8/3644 MCU FLASH 32K 64SDIP
• Manufacturer: Renesas Electronics America
• Series: H8® H8/300Lr

Specifications of HD64F3644PV

• Core Processor: H8/300L
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SCI
• Peripherals: PWM, WDT
• Number Of I /o: 53
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 64-SDIP (0.750", 19.05mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

Section 9 Timers
9.6.3
The watchdog timer has an 8-bit counter (TCW) that is incremented by clock input ( /8192).
When TCSRWE = 1 in TCSRW, if 0 is written in B2WI and 1 is simultaneously written in
WDON, TCW starts counting up (two write accesses to TCSRW are necessary in order to operate
the watchdog timer). When the TCW count value reaches H'FF, the next clock input causes the
watchdog timer to overflow and generates an internal reset signal. The internal reset signal is
output for 512 clock cycles of the
count up from the written value. The overflow period can be set in the range from 1 to 256 input
clocks, depending on the value written in TCW.
Figure 9.36 shows an example of watchdog timer operations.
Example:
The value set in TCW should therefore be 256 – 15 = 241 (H'F1).
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REJ09B0326-0600
Internal reset
signal
TCW count
value
H'FF
H'00
Timer Operation
4
8192
= 4 MHz and the desired overflow period is 30 ms.
10
Figure 9.36 Typical Watchdog Timer Operations (Example)
H'F1
6
H'F1 written
in TCW
30
10
–3
Start
= 14.6
OSC
clock. It is possible to write to TCW, causing TCW to
H'F1 written in TCW
512
OSC
Reset
TCW overflow
clock cycles