DF2437FV Renesas Electronics America, DF2437FV Datasheet - Page 479
![IC H8S/2437 MCU FLASH 128QFP](/photos/12/29/122945/df2437fv_sml.jpg)
DF2437FV
Manufacturer Part Number
DF2437FV
Description
IC H8S/2437 MCU FLASH 128QFP
Manufacturer
Renesas Electronics America
Series
H8® H8S/2400r
Specifications of DF2437FV
Core Processor
H8S/2600
Core Size
16-Bit
Speed
20MHz
Connectivity
I²C, SCI
Peripherals
POR, PWM, WDT
Number Of I /o
85
Program Memory Size
256KB (256K x 8)
Program Memory Type
FLASH
Ram Size
16K x 8
Voltage - Supply (vcc/vdd)
3 V ~ 3.6 V
Data Converters
A/D 16x10b
Oscillator Type
Internal
Operating Temperature
-20°C ~ 75°C
Package / Case
128-QFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
DF2437FV
Manufacturer:
Renesas Electronics America
Quantity:
10 000
- Current page: 479 of 776
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15.3
15.3.1
To use the WDT as a watchdog timer, set the WT/IT bit and the TME bit in TCSR to 1. While the
WDT is used as a watchdog timer, if TCNT overflows without being rewritten because of a
system malfunction or another error, an internal reset or NMI interrupt request is generated. TCNT
does not overflow while the system is operating normally. Software must prevent TCNT
overflows by rewriting the TCNT value (normally writing H'00) before overflows occurs.
If the RST/NMI bit in TCSR is set to 1, when the TCNT overflows, an internal reset signal for this
LSI is issued for 518 system clocks as shown in figure 15.2. If the RST/NMI bit is cleared to 0,
when the TCNT overflows, an NMI interrupt request is generated.
An internal reset request from the watchdog timer and a reset input from the RES pin are
processed in the same vector. A reset source can be identified by the state of the XRST bit in
SYSCR. If a reset caused by a signal input to the RES pin occurs at the same time as a reset
caused by a WDT overflow, the RES pin reset has priority and the XRST bit in SYSCR is set to 1.
An NMI interrupt request from the watchdog timer and an interrupt request from the NMI pin are
processed in the same vector. Do not handle an NMI interrupt request from the watchdog timer
and an interrupt request from the NMI pin at the same time.
Operation
Watchdog Timer Mode
Internal reset signal
Note: * After the OVF bit becomes 1, it is cleared to 0 by an internal reset.
[Legend]
WT/ :
TME:
OVF:
Figure 15.2 Watchdog Timer Mode (RST/NMI = 1) Operation
H'FF
H'00
The XRST bit is also cleared to 0.
Timer mode select bit
Timer enable bit
Overflow flag
TCNT value
WT/
TME = 1
= 1
Write H'00 to
TCNT
518 system clocks
Overflow
OVF = 1*
Rev.2.00 May. 28, 2009 Page 439 of 732
WT/
TME = 1
= 1
Write H'00 to
TCNT
REJ09B0059-0200
Time
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