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EM78P809N
8-Bit Microcontroller
Product Specification (V1.0) 07.26.2005
• 17
(This specification is subject to change without further notice)
TBKTC − TBT/Keytone Control ( Address: 0Eh )
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
TEN TCK1 TCK0 0 TBTEN TBTCK2 TBTCK1 TBTCK0
Bit 7 ( TEN ) : Keytone enable control
TEN = “0” : Disable
TEN = “1” : Enable
Bit 6 ~ Bit 5 ( TCK1 ~ TCK0 ) : Keytone Output Clock Source Select
TCK1 TCK0
Clock Source
( Normal, Idle )
Keytone Output Frequency
( Fc = 8MHz )
0 0 Fc/2
13
0.976kHz
0 1 Fc/2
12
1.953kHz
1 0 Fc/2
11
3.906kHz
1 1 Fc/2
10
7.812kHz
Bit 3 ( TBTEN ) : Time Base Timer Enable Control
TBTEN = “0” : Disable
TBTEN = “1” : Enable
Bit 2 ~ Bit 0 ( TBTCK2 ~ TBTCK0 ) : Time Base Timer Clock Source Select
TBTCK2 TBTCK1 TBTCK0
Clock Source
( Normal, Idle )
Interrupt Frequency
( Fc = 8MHz )
0 0 0 Fc/2
23
0.95Hz
0 0 1 Fc/2
21
3.81Hz
0 1 0 Fc/2
16
122.07Hz
0 1 1 Fc/2
14
488.28Hz
1 0 0 Fc/2
13
976.56Hz
1 0 1 Fc/2
12
1953.12Hz
1 1 0 Fc/2
11
3906.25Hz
1 1 1 Fc/2
9
15625Hz
Register Bank 2 ( R3 bits (7, 6) = (1, 0) )
URC1 − UART Control Register 1 ( Address: 05h )
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
URTD8 UMODE1 UMODE0 BRATE2 BRATE1 BRATE0 UTBE TXE
Bit 7 ( URTD8 ) : Transmission data bit 8