IBM EM78P809N Manuale Utente
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 (4μs) 48us(20.8kHz)
0 1
Fc/16
4MHz
250kHz (4μs) 48us(20.8kHz)
1 0
Fc/32
8MHz
250kHz (4μs) 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”.
P63 must be set to “1” before keytone enable and it can be halted by setting P63 to “0”.