TMP91xy20AFG Toshiba, TMP91xy20AFG Datasheet - Page 216

• Manufacturer Part Number: TMP91xy20AFG
• Manufacturer: Toshiba

Specifications of TMP91xy20AFG

• Package: LQFP144
• Rom Types(m=mask,p=otp, F=flash,e=eeprom): M
• Rom Combinations: 8
• Ram Combinations: 8
• Architecture: 16-bit CISC
• Usb/spi Channels: -
• Uart/sio Channels: 1
• I2c/sio Bus Channels: 1
• (s)dram Controller: 1
• Adc 10-bit Channel: 8
• Da Converter: -
• Timer 8-bit Channel: 4
• Timer 16-bit Channel: 1
• Pwm 8-bit Channels: -
• Pwm 16-bit Channels: -
• Cs/wait Controller: 4
• Dual Clock: Y
• Number Of I/o Ports: 77
• Power Supply Voltage(v): 3.0 to 3.6

3.12 Watchdog Timer (Runaway detection timer)
3.12.1
Internal reset
CPU has started to malfunction (Runaway) due to causes such as noise. When the watchdog
timer detects a malfunction, it generates a non-maskable interrupt INTWD to notify the CPU of
the malfunction.
external
The TMP91C820A features a watchdog timer for detecting runaway.
The watchdog timer (WDT) is used to return the CPU to normal state when it detects that the
Connecting the watchdog timer output to the reset pin internally forces a reset. (The level of
(f
Note:
FPH
Configuration
f
SYS
/2)
Figure 3.12.1 is a block diagram of he watchdog timer (WDT).
RESET
The watchdog timer cannot operate by disturbance noise in some case.
Take care when design the device.
WDMOD
<WDTP1:0>
pin is not changed.)
Figure 3.12.1 Block Diagram of Watchdog Timer
Binary counter
(22 Stage)
2
15
WDT control register WDCR
2
17
Selector
Write
4EH
2
Internal data bus
19
91C820A-214
Reset
2
21
Write
B1H
WDMOD<RESCR>
R
Reset control
WDMOD<WDTE>
Q
S
WDTI interrupt
Internal reset
TMP91C820A
RESET
2008-02-20