EM78P809N
8-Bit Microcontroller
Product Specification (V1.0) 07.26 .2 005 • 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. Conv ersion
Rate
0 0 F c/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 TB TCK0
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 C onfiguration

Keytone output can generate 50 % duty pulse for driving a piezo-electri c buzzer. The

P63 must be set to “1” before keytone enable and it can be halted by setting P63 to “0”.