EM78P809N
8-Bit Microcontroller
Product Specification
(V1.0) 07.26.2005
•
31
(This specification is subject to change without further notice)
Table 5
ADCK1:0 Operation Mode
Max. Frequency
(Fc)
Max. Conversion
Rate per Bit
Max. Conversion
Rate
0 0
Fc/4
1MHz
250kHz (4
μ
s) 48us(20.8kHz)
0 1
Fc/16
4MHz
250kHz (4
μ
s) 48us(20.8kHz)
1 0
Fc/32
8MHz
250kHz (4
μ
s) 8us(20.8kHz)
1 1
Reserved
-
-
-
4.6 Time Base Timer and Keytone Generator
Registers for AD Converter Circuit
R_BANK Address NAME Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
BANK 1
0X0E
TBKTC
TEN TCK1 TCK0
0
TBTEN TBTCK2 TBTCK1 TBTCK0
R/W R/W R/W -- R/W R/W R/W R/W
BANK 0
0x0F
ISFR2
0 UERRIF RBFF
TBEF
TBIF
EXIF1 0 TCIF0
0 R/W
R/W
R/W
R/W
R/W 0 R/W
SPR 0x0F
IMR2
0 UERRIE URIE
UTIE
TBIE
EXIE1 0 TCIE0
0 R/W
R/W
R/W
R/W
R/W 0 R/W
MUX
Fosc/2
Fosc/2
Fosc/2
Fosc/2
13
12
11
10
TBKTC
TCK1:0
2
/TONE Pin
TEN
D Q
Output Latch
Data Output
Output Enable (P63)
Fig. 7. TONE Output Pin Configuration
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”.
