HD6477021X20V Renesas Electronics America, HD6477021X20V Datasheet - Page 354
HD6477021X20V
Manufacturer Part Number
HD6477021X20V
Description
MCU 5V 32K PB-FREE 100-TQFP
Manufacturer
Renesas Electronics America
Series
SuperH® SH7020r
Datasheet
1.HD6417020SVX12IV.pdf
(511 pages)
Specifications of HD6477021X20V
Core Processor
SH-1
Core Size
32-Bit
Speed
20MHz
Connectivity
EBI/EMI, SCI
Peripherals
DMA, POR, PWM, WDT
Number Of I /o
32
Program Memory Size
32KB (32K x 8)
Program Memory Type
OTP
Ram Size
1K x 8
Voltage - Supply (vcc/vdd)
4.5 V ~ 5.5 V
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
-
Data Converters
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
HD6477021X20V
Manufacturer:
Renesas Electronics America
Quantity:
10 000
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12.3.2
To use the WDT as an interval timer, clear WT/IT to 0 and set TME to 1. An interval timer
interrupt (ITI) is generated each time the timer counter overflows. This function can be used to
generate interval timer interrupts at regular intervals (figure 12.5).
12.3.3
The watchdog timer has a special function to clear the standby mode with an NMI interrupt. When
using the standby mode, set the WDT as described below.
Transition to the Standby Mode: The TME bit in the TCSR must be cleared to 0 to stop the
watchdog timer counter before it enters the standby mode. The chip cannot enter the standby mode
while the TME bit is set to 1. Set bits CKS2–CKS0 so that the counter overflow interval is equal
to or longer than the oscillation settling time. See section 20.3, AC Characteristics, for the
oscillation settling time.
Recovery from the Standby Mode: When an NMI request signal is received in standby mode,
the clock oscillator starts running and the watchdog timer starts counting at the rate selected by
bits CKS2–CKS0 before the standby mode was entered. When the TCNT overflows (changes
from H'FF–H'00), the system clock ( ) is presumed to be stable and usable; clock signals are
supplied to the entire chip and the standby mode ends.
For details on the standby mode, see section 19, Power Down States.
RENESAS 336
H'FF
H'00
TCNT value
WT/IT = 0
Operation in the Interval Timer Mode
Operation in the Standby Mode
TME = 1
Figure 12.5 Operation in the Interval Timer Mode
Overflow
ITI
Overflow
ITI
Overflow
ITI
Overflow
ITI
Time
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