em78p131a ELAN Microelectronics Corp, em78p131a Datasheet - Page 13

• 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)
5.2 Special Function Registers
5.2.1 A (Accumulator)
5.2.2 CONT (Control Register)
Bit 0 ~ Bit 2 (PSR0 ~ PSR2): TCC/WDT prescaler bits
Bit 3 (PAB): Prescaler Assigned Bit
Bit 4 (TE): TCC signal edge
Bit 5 (TS): TCC signal source
Bit 6 (/INT): Interrupt enable flag
Bit 7:
The CONT register is both readable and writable.
5.2.3 IOC6 (I/O Port Control Register)
IOC6 registers are both readable and writable.
Internal data transfer operation, or instruction operand holding usually involves the
temporary storage function of the Accumulator, which is not an addressable register.
Bit 7
PSR2
-
0
0
0
0
1
1
1
1
0 : TCC
1 : WDT
0 : increment if a transition from low to high takes place on the TCC pin
1 : increment if a transition from high to low takes place on the TCC pin
0 : internal instruction cycle clock, P62 is a bidirectional I/O pin
1 : transition on TCC pin
0 : masked by DISI or hardware interrupt
1 : enabled by ENI/RETI instructions
Not used
0 : defines the relative I/O pin as output
1 : sets the relative I/O pin into high impedance
Bit 6
/INT
PSR1
0
0
1
1
0
0
1
1
Bit 5
TS
PSR0
0
1
0
1
0
1
0
1
Bit 4
TE
Bit 3
PAB
8-Bit Microcontroller with OTP ROM
TCC Rate
1:2
1:4
1:8
1:16
1:32
1:64
1:128
1:256
PSR2
Bit 2
PSR1
Bit 1
EM78P131A
WDT Rate
1:1
1:2
1:4
1:8
1:16
1:32
1:64
1:128
PSR0
Bit 0
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