Time Base Timer And Keytone Generator - IBM EM78P809N Specification

Table 5
ADCK1:0 Operation Mode
0 0
0 1
1 0
1 1

4.6 Time Base Timer and Keytone Generator

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