HD64F36077GHV Renesas Electronics America, HD64F36077GHV Datasheet - Page 301
![16BIT MCU FLASH 56K, SMD, LQFP64](/photos/19/6/190684/ge64qfp05-40_sml.jpg)
HD64F36077GHV
Manufacturer Part Number
HD64F36077GHV
Description
16BIT MCU FLASH 56K, SMD, LQFP64
Manufacturer
Renesas Electronics America
Datasheet
1.HD64F36077GHV.pdf
(524 pages)
Specifications of HD64F36077GHV
No. Of I/o's
47
Ram Memory Size
4KB
Cpu Speed
20MHz
No. Of Timers
4
Digital Ic Case Style
LQFP
Supply Voltage Range
4.5V
Core Size
16bit
Program Memory Size
56KB
Oscillator Type
External Only
Controller Family/series
H8/300H
Peripherals
ADC
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
HD64F36077GHV
Manufacturer:
RENESAS
Quantity:
340
Part Number:
HD64F36077GHV
Manufacturer:
RENESAS/瑞萨
Quantity:
20 000
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14.3
The watchdog timer is provided with an 8-bit counter. After the reset state is released, TCWD
starts counting up. When the TCWD count value overflows H'FF, an internal reset signal is
generated. The internal reset signal is output for a period of 256 φ
writable counter, it starts counting from the value set in TCWD. An overflow period in the range
of 1 to 256 input clock cycles can therefore be set, according to the TCWD set value. When the
watchdog timer is not used, stop TCWD counting by writing 0 to B2WI and WDON
simultaneously while the TCSRWE bit in TCSRWD is set to 1. (To stop the watchdog timer, two
write accesses to TCSRWD are required.)
Figure 14.2 shows an example of watchdog timer operation.
Example:
Operation
Internal reset
signal
count value
TCWD
With 30-ms overflow period when φ = 4 MHz
Therefore, 256 – 15 = 241 (H'F1) is set in TCW.
H'FF
H'00
4 × 10
8192
H'F1
Figure 14.2 Watchdog Timer Operation Example
6
× 30 × 10
H'F1 written
to TCWD
–3
= 14.6
H'F1 written to TCWD
Rev. 1.00 Sep. 16, 2005 Page 271 of 490
256 φ
OSC
clock cycles. As TCWD is a
Reset generated
OSC
TCWD overflow
clock cycles
Section 14 Watchdog Timer
REJ09B0216-0100
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