COP8SAA716M9 National Semiconductor, COP8SAA716M9 Datasheet - Page 35

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COP8SAA716M9

Manufacturer Part Number
COP8SAA716M9
Description
IC MCU OTP 8BIT 1K 16SOIC
Manufacturer
National Semiconductor
Series
COP8™ 8SAr
Datasheet

Specifications of COP8SAA716M9

Core Processor
COP8
Core Size
8-Bit
Speed
10MHz
Connectivity
Microwire/Plus (SPI)
Peripherals
POR, PWM, WDT
Number Of I /o
12
Program Memory Size
1KB (1K x 8)
Program Memory Type
OTP
Ram Size
64 x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Oscillator Type
Internal
Operating Temperature
0°C ~ 70°C
Package / Case
16-SOIC (0.300", 7.5mm Width)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Data Converters
-
Other names
*COP8SAA716M9
COP8SAA716M9B

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10.0 WATCHDOG/Clock Monitor
10.3 WATCHDOG AND CLOCK MONITOR SUMMARY
The following salient points regarding the WATCHDOG and
CLOCK MONITOR should be noted:
• Both the WATCHDOG and CLOCK MONITOR detector
• Following RESET, the WATCHDOG and CLOCK MONI-
• The WATCHDOG service window and CLOCK MONI-
• The initial WATCHDOG service must match the key data
• Subsequent WATCHDOG services must match all three
• The correct key data value cannot be read from the
• The WATCHDOG detector circuit is inhibited during both
• The CLOCK MONITOR detector circuit is active during
• With the single-pin R/C oscillator option selected and the
• With the crystal oscillator option selected, or with the
• The IDLE timer T0 is not initialized with external RESET.
• The user can sync in to the IDLE counter cycle with an
circuits are inhibited during RESET.
TOR are both enabled, with the WATCHDOG having the
maximum service window selected.
TOR enable/disable option can only be changed once,
during the initial WATCHDOG service following RESET.
value in the WATCHDOG Service register WDSVR in
order to avoid a WATCHDOG error.
data fields in WDSVR in order to avoid WATCHDOG
errors.
WATCHDOG Service register WDSVR. Any attempt to
read this key data value of 01100 from WDSVR will read
as key data value of all 0’s.
the HALT and IDLE modes.
both the HALT and IDLE modes. Consequently, the de-
vice inadvertently entering the HALT mode will be de-
tected as a CLOCK MONITOR error (provided that the
CLOCK MONITOR enable option has been selected by
the program).
CLKDLY bit reset, the WATCHDOG service window will
resume following HALT mode from where it left off before
entering the HALT mode.
single-pin R/C oscillator option selected and the CLKDLY
bit set, the WATCHDOG service window will be set to its
selected value from WDSVR following HALT. Conse-
quently, the WATCHDOG should not be serviced for at
least 256 instruction cycles following HALT, but must be
serviced within the selected window to avoid a WATCH-
DOG error.
IDLE counter (T0) interrupt or by monitoring the T0PND
flag. The T0PND flag is set whenever the twelfth bit of the
IDLE counter toggles (every 4096 instruction cycles). The
user is responsible for resetting the T0PND flag.
Don’t Care
Don’t Care
Mismatch
Match
Data
Key
Don’t Care
Don’t Care
Mismatch
Window
Match
Data
TABLE 8. WATCHDOG Service Actions
Don’t Care
Don’t Care
Mismatch
Monitor
Clock
Match
(Continued)
35
Valid Service: Restart Service Window
Error: Generate WATCHDOG Output
Error: Generate WATCHDOG Output
Error: Generate WATCHDOG Output
10.4 DETECTION OF ILLEGAL CONDITIONS
The device can detect various illegal conditions resulting
from coding errors, transient noise, power supply voltage
drops, runaway programs, etc.
Reading of undefined ROM gets zeroes. The opcode for
software interrupt is 00. If the program fetches instructions
from undefined ROM, this will force a software interrupt, thus
signaling that an illegal condition has occurred.
The subroutine stack grows down for each call (jump to
subroutine), interrupt, or PUSH, and grows up for each
return or POP. The stack pointer is initialized to RAM location
06F Hex during reset. Consequently, if there are more re-
turns than calls, the stack pointer will point to addresses 070
and 071 Hex (which are undefined RAM). Undefined RAM
from addresses 070 to 07F (Segment 0), and all other seg-
ments (i.e., Segments 4 … etc.) is read as all 1’s, which in
turn will cause the program to return to address 7FFF Hex.
This is an undefined ROM location and the instruction
fetched (all 0’s) from this location will generate a software
interrupt signaling an illegal condition.
Thus, the chip can detect the following illegal conditions:
1. Executing from undefined ROM
2. Over “POP”ing the stack by having more returns than
When the software interrupt occurs, the user can re-initialize
the stack pointer and do a recovery procedure before restart-
ing (this recovery program is probably similar to that follow-
ing reset, but might not contain the same program initializa-
tion procedures). The recovery program should reset the
software interrupt pending bit using the RPND instruction.
• A hardware WATCHDOG service occurs just as the de-
• Following RESET, the initial WATCHDOG service (where
• In order to RESET the device on the occurrence of a
vice exits the IDLE mode. Consequently, the WATCH-
DOG should not be serviced for at least 256 instruction
cycles following IDLE, but must be serviced within the
selected window to avoid a WATCHDOG error.
the service window and the CLOCK MONITOR enable/
disable must be selected) may be programmed any-
where within the maximum service window (65,536 in-
struction cycles) initialized by RESET. Note that this initial
WATCHDOG service may be programmed within the ini-
tial 256 instruction cycles without causing a WATCHDOG
error.
WATCH event, the user must connect the WDOUT pin
(G1) pin to the RESET external to the device. The weak
pull-up on the WDOUT pin is sufficient to provide the
RESET connection to V
Power On Reset and WATCHDOG.
calls.
Action
CC
for devices which use both
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