MB90F654A FUJITSU [Fujitsu Component Limited.], MB90F654A Datasheet - Page 70

• Manufacturer Part Number: MB90F654A
• Description: 16-bit Proprietary Microcontroller
• Manufacturer: FUJITSU [Fujitsu Component Limited.]

70
MB90650A Series
16. DTMF Generator
(1) Register list
(2) Block diagram
DTMF control register (DTMC)
DTMF data register (DTMD)
The DTMF (dual tone multifrequency) generator is a module that can generate a series of audio tones as heard
from a push-button telephone or a radio transceiver with a keypad. It has the following features:
Internal clock
Capable of generating DTMF tones continuously (or even a single tone)
Capable of generating all CCITT tones: 0 to 9, *, #, A to D
R/W
—
Address : 000089
Address : 000088
Frequency divider
X : Undefined
: Read/write enabled
: Unused
Preset counter
DTMF data register (DTMD)
ROW/COL
decoder
H
H
Terminate
bit 15
Frequency
bit 7
—
—
—
—
select
Clock pulse
Frequency
Control signal generator
select
CSL2 CSL1 CSL0
bit 14
R/W
bit 6
—
—
Internal bus
Count clock
bit 13
R/W
bit 5
—
—
bit 12
R/W
bit 4
—
—
COL staircase
ROW staircase
generator
generator
DTMF control register (DTMC)
DDAT3 DDAT2 DDAT1
bit 11
CDIS
R/W
R/W
bit 3
bit 10
RDIS OUTE
R/W
R/W
bit 2
R/W
R/W
bit 9
bit 1
Voltage data
Adder
Frequency
divider
DDAT0
R/W
bit 8
bit 0
—
—
Frequency
select
0 0 0 X 0 0 0 0
0 0 0 0 0 0 0 0
Initial value
Initial value
DTMF
B
B