em78p131a ELAN Microelectronics Corp, em78p131a Datasheet - Page 31

• Manufacturer Part Number: em78p131a
• Description: 8-bit Microcontroller With Otp Rom
• Manufacturer: ELAN Microelectronics Corp

Product Specification (V1.2) 09.16.2009
(This specification is subject to change without further notice)
Table 8 Internal RC Drift Rate (Ta=25 ° C, VDD=5V ± 5%, VSS=0V)
Note: These are theoretical values provided for reference only. Actual values may vary depending on the
5.8 Code Option Register
The EM78P131A has a Code Option word that is not a part of the normal program
memory. The option bits cannot be accessed during normal program execution.
5.8.1 Code Option Register (Word 0)
Bit 12 (/RESET): Define Pin 6.3 as a reset pin
Bit 11 (/ENWTD): Watchdog timer enable bit
Bit 10 (CLKS): Instruction period option bit
/RESET /ENWDT
Bit 12
Internal RC
This bit must be enabled and the WDTE register (IOCE reg. Bit 6) must be disabled when
Port 6 pin change wake-up function is used.
455kHz
8 MHz
4 MHz
1 MHz
actual process.
Code Option Register and Customer ID Register Arrangement Distribution:
Bit 12 ~ Bit 0
Bit 11
Word 0
Temperature
Bit 10
CLKS
(0°C~70°C)
± 3%
± 3%
± 3%
± 3%
1 : Disable
0 : /RESET enable
1 : /RESET disable
0 : Enable
0 : Two oscillator periods
1 : Four oscillator periods
Refer to the Instruction Set section.
OSC1 OCS0
Bit 9
Bit 8
(2.3V~5.5V)
Bit 12 ~ Bit 0
Voltage
Bit 7
± 5%
± 5%
± 5%
± 5%
Word 1
Word 0
CS
Note
Drift Rate
SUT1
Bit 6
8-Bit Microcontroller with OTP ROM
SUT0
Bit 5
Process
± 10%
± 10%
± 10%
± 5%
TYPE RCOUT C2
Bit 4
Bit 12 ~ Bit 0
Bit 3 Bit 2 Bit 1 Bit 0
Word 2
EM78P131A
± 18%
± 13%
± 18%
± 18%
Total
C1
• 27
C0