em78p809n ELAN Microelectronics Corp, em78p809n Datasheet - Page 27

• Manufacturer Part Number: em78p809n
• Description: 8-bit Microcontroller
• Manufacturer: ELAN Microelectronics Corp

Product Specification (V1.0) 07.26.2005
(This specification is subject to change without further notice)
4.3 Special Purpose Registers
A
WDTO
Bit 7
(Accumulator)
CONT (Control Register)
Bit 7 ( WDTO ) : WDT output select
Bit 6 ( /INT ) : Interrupt enable flag
Bit 5 ~ Bit 4 ( WDTP1 ~ WDTP0 ) : WDT prescaler bits.
Bit 3 ( WDTE ) : WDT enable control.
Bit 2 ( PSR2 ) ~ Bit 0 ( PSR0 ) : TCC prescaler bits.
PSR2
0
0
0
0
1
1
1
1
Internal data transfer, or instruction operand holding.
It cannot be addressed.
CONT register is both readable and writable.
WDTP1
WDTO = “0” : Interrupt request
WDTO = “1” : Internal reset
/INT = “0” : masked by DISI or hardware interrupt
/INT = “1” : enabled by ENI/RETI instructions
WDTE = “0” : Disable
WDTE = “1” : Enable
0
0
1
1
Bit 6
/INT
WDTP1
Bit 5
PSR1
0
0
1
1
0
0
1
1
WDTP0
Bit 4
WDTP0
0
1
0
1
WDTE
Bit 3
PSR0
0
1
0
1
0
1
0
1
PSR2
Bit 2
8-Bit Microcontroller
Operating Mode
PSR1
Operating Mode
Bit 1
1:256
1:16
1:64
1:4
EM78P809N
1:128
1:256
1:16
1:32
1:64
1:2
1:4
1:8
PSR0
Bit 0
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