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R01UH0336EJ0102 Rev.1.02
Page 387 of 1538
Jul 17, 2014
V850E2/PG4-L
Section 12 Window Watchdog Timer A (WDTA)
Interrupts and
reset outputs
The interrupts and reset outputs of the WDTAn are listed in the table below.
Caution
The WDTA0TNMI signal is output in synchronization with the counter clock
(WDTATCKI). Therefore, when the WDTA0TNMI signal is asserted, the
SGAmESSTR0.SGAmSSE003 must be cleared after one cycle of WDTATCKI.
12.2 Functional Overview
Features summary
The WDTA has the following functions.
• Operation in response to error detection is selectable.
– Generation of NMI request (WDTAnTNMI) on error detection
– Generation of reset (WDTAnTRES) on error detection
• Interrupt request generation at 75% of the counter overflow value
• Window function
The following figure shows the main components of the WDTA.
Figure 12-1
Block Diagram of the WDTA
Table 12-4
WDTA Interrupts and Reset Outputs
WDTAn Signal
Function
Connected to
WDTA0TRES
WDTA0 error reset
Reset controller: WDTA0RES
Safety guardian: SGATERRIN3
WDTA0TNMI
WDTA0 error NMI
Interrupt controller: INTWDTA0NMI
Safety guardian: SGATERRIN3
WDTA0TIT
WDTA0 75% interrupt
Interrupt controller: INTWDTA0
WDTATCKI
WDTAnTNMI
WDTATCKI / 2
16
WDTAnTRES
WDTAnTIT
WDTATCKI / 2
15
WDTATCKI / 2
14
WDTATCKI / 2
13
WDTATCKI / 2
12
WDTATCKI / 2
11
WDTATCKI / 2
10
WDTATCKI / 2
9
WDTAnMD
WDTAnWDTE
Internal bus
Trigger/
start control
16-bit counter
Selector
Error detection
&
75% interrupt control