em78p809n ELAN Microelectronics Corp, em78p809n Datasheet - Page 21

• 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)
URTD8
TBTCK2
Bit 7
Bit 7
TEN
TBKTC − TBT/Keytone Control ( Address: 0Eh )
Bit 7 ( TEN ) : Keytone enable control
Register Bank 2 ( R3 bits (7, 6) = (1, 0) )
URC1 − UART Control Register 1 ( Address: 05h )
Bit 6 ~ Bit 5 ( TCK1 ~ TCK0 ) : Keytone Output Clock Source Select
Bit 3 ( TBTEN ) : Time Base Timer Enable Control
Bit 2 ~ Bit 0 ( TBTCK2 ~ TBTCK0 ) : Time Base Timer Clock Source Select
Bit 7 ( URTD8 ) : Transmission data bit 8
TCK1
0
0
0
0
1
1
1
1
0
0
1
1
TEN = “0” : Disable
TEN = “1” : Enable
TBTEN = “0” : Disable
TBTEN = “1” : Enable
UMODE1 UMODE0
TCK1
Bit 6
Bit 6
TBTCK1
0
0
1
1
0
0
1
1
TCK0
0
1
0
1
TCK0
Bit 5
Bit 5
TBTCK0
0
1
0
1
0
1
0
1
BRATE2
Bit 4
Bit 4
0
( Normal, Idle )
Clock Source
Fc/
Fc/
Fc/
Fc/
( Normal, Idle )
Clock Source
BRATE1
TBTEN
2
2
2
2
Bit 3
13
12
11
10
Bit 3
Fc/
Fc/
Fc/
Fc/
Fc/
Fc/
Fc/
Fc/
2
2
2
2
2
2
2
2
23
21
16
14
13
12
11
9
TBTCK2
BRATE0
Bit 2
Bit 2
Keytone Output Frequency
8-Bit Microcontroller
Interrupt Frequency
( Fc = 8MHz )
TBTCK1
UTBE
0.976kHz
1.953kHz
3.906kHz
7.812kHz
Bit 1
Bit 1
( Fc = 8MHz )
1953.12Hz
3906.25Hz
122.07Hz
488.28Hz
976.56Hz
15625Hz
EM78P809N
0.95Hz
3.81Hz
TBTCK0
Bit 0
Bit 0
TXE
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