Справочник Пользователя для IBM EM78P312N
EM78P312N
8-Bit Microcontroller
26
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Product Specification (V1.0) 10.03.2006
(This specification is subject to change without further notice)
5.6 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
TEN TCK1 TCK0
0
TBTEN TBTCK2 TBTCK1 TBTCK0
Bank 1
0X0E
TBKTC
R/W R/W R/W -- R/W R/W R/W R/W
0 UERRIF RBFF
TBEF
TBIF
EXIF1 0 TCIF0
Bank 0
0x0F
ISFR2
0 R/W
R/W
R/W
R/W
R/W 0 R/W
0 UERRIE URIE
UTIE
TBIE
EXIE1 0 TCIE0
SPR 0x0F
IMR2
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. 5-6 Tone Output Pin Configuration
The Keytone output can generate 50% duty pulse for driving a piezo-electric buzzer.
The P63 must be set to “1” before the keytone is enabled and it can be halted by setting
P63 to “0”.
The P63 must be set to “1” before the keytone is enabled and it can be halted by setting
P63 to “0”.
P63
TEN
TONE Pin
Fig. 5-7 Tone Output Pin Timing Chart