IBM EM78P809N Specification page 21

TBKTC − TBT/Keytone Control ( Address: 0Eh )
Bit 7
TEN
Bit 7 ( TEN ) : Keytone enable control
Bit 6 ~ Bit 5 ( TCK1 ~ TCK0 ) : Keytone Output Clock Source Select
TCK1
Bit 3 ( TBTEN ) : Time Base Timer Enable Control
Bit 2 ~ Bit 0 ( TBTCK2 ~ TBTCK0 ) : Time Base Timer Clock Source Select
TBTCK2
0
0
0
0
1
1
1
1
Register Bank 2 ( R3 bits (7, 6) = (1, 0) )
URC1 − UART Control Register 1 ( Address: 05h )
Bit 7
URTD8
Bit 7 ( URTD8 ) : Transmission data bit 8
Product Specification (V1.0) 07.26.2005
(This specification is subject to change without further notice)
Bit 6 Bit 5
TCK1 TCK0
TEN = "0" : Disable
TEN = "1" : Enable
TCK0
0 0
0 1
1 0
1 1
TBTEN = "0" : Disable
TBTEN = "1" : Enable
TBTCK1 TBTCK0
0
0
1
1
0
0
1
1
Bit 6 Bit 5
UMODE1 UMODE0
Bit 4 Bit 3
0 TBTEN
Clock Source
( Normal, Idle )
13
Fc/
2
12
Fc/
2
11
Fc/
2
10
Fc/
2
Clock Source
( Normal, Idle )
23
0 Fc/
2
21
1 Fc/
2
16
0 Fc/
2
14
1 Fc/
2
13
0 Fc/
2
12
1 Fc/
2
11
0 Fc/
2
9
1 Fc/
2
Bit 4 Bit 3
BRATE2 BRATE1
EM78P809N
8-Bit Microcontroller
Bit 2 Bit 1 Bit 0
TBTCK2 TBTCK1 TBTCK0
Keytone Output Frequency
( Fc = 8MHz )
0.976kHz
1.953kHz
3.906kHz
7.812kHz
Interrupt Frequency
( Fc = 8MHz )
0.95Hz
3.81Hz
122.07Hz
488.28Hz
976.56Hz
1953.12Hz
3906.25Hz
15625Hz
Bit 2 Bit 1 Bit 0
BRATE0 UTBE TXE
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