em78p809n ELAN Microelectronics Corp, em78p809n Datasheet - Page 35

• 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)
4.6 Time Base Timer and Keytone Generator
Table 5
Registers for AD Converter Circuit
Keytone output can generate 50% duty pulse for driving a piezo-electric buzzer. The
P63 must be set to “1” before keytone enable and it can be halted by setting P63 to “0”.
R_BANK Address NAME Bit 7
ADCK1:0 Operation Mode
BANK 1
BANK 0
Fosc/2
Fosc/2
Fosc/2
Fosc/2
SPR
0 0
0 1
1 0
1 1
13
12
11
10
TCK1:0
Data Output
0X0E
0x0F
0x0F
Reserved
Fc/16
Fc/32
Fc/4
MUX
TBKTC
ISFR2
IMR2
2
TBKTC
Fig. 7. TONE Output Pin Configuration
TEN
R/W
Output Latch
Max. Frequency
0
0
0
0
D
UERRIF RBFF
UERRIE URIE
1MHz
4MHz
8MHz
(Fc)
TCK1
Bit 6
R/W
R/W
R/W
Q
-
TEN
TCK0
Bit 5
R/W
R/W
R/W
Max. Conversion
TBEF
Bit 4
UTIE
R/W
R/W
250kHz (4μs)
250kHz (4μs)
250kHz (4μs)
--
0
Rate per Bit
TBTEN TBTCK2 TBTCK1 TBTCK0
Bit 3
TBIF
TBIE
-
R/W
R/W
R/W
Output Enable (P63)
EXIE1
EXIF1
Bit 2
8-Bit Microcontroller
R/W
R/W
R/W
Max. Conversion
48us(20.8kHz)
48us(20.8kHz)
8us(20.8kHz)
EM78P809N
Bit 1
R/W
0
0
0
0
Rate
/TONE Pin
-
TCIE0
TCIF0
Bit 0
R/W
R/W
R/W
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