XC68HC705F32 Motorola, XC68HC705F32 Datasheet - Page 79

• Manufacturer Part Number: XC68HC705F32
• Description: MICROCONTROLLER
• Manufacturer: Motorola

MC68HC05F32
When square wave 2 or square wave 3 mode is selected, the TNX pin is activated. The idle state
for TNX is a logic high. The final state of the TNX pin is still dependent on the values of TGER,
TGEC (see
The state of the TNO pin depends on the value of the TNOE bit. After a RESET, the TNOE is
cleared and the TNO pin is tristate. When TNOE is set, the TNO output is activated. If the TGER
and TGEC bits are held low and TNOE is set, the dc offset of V
mode, the TNX pin is high and the TNO pin is tristate.
When both MS1 and MS0 are set (square wave 3), the generator can generate both single tone
melody at the column path, and ToneX at the row path simultaneously.
TGER — Tone generator enable row path
TGEC — Tone generator enable column path
TNOE — Tone output enable
1 (set)
0 (clear) –
1 (set)
0 (clear) –
1 (set)
0 (clear) –
Table
–
–
–
Note: The legal values in the FCR register column are illegal to the FCC register,
7-4), FCR and FCC bits (when illegal values are input).
register
FCR
$00
$01
$02
$03
Row path on
Row path off
Column path on
Column path off
TNO on
TNO off
and vice versa. An input of illegal values to these registers will produce a
high at TNX output and V
Table 7-1 Bit description for DTMF generation
register
FCC
$10
$11
$12
$13
DTMF/MELODY GENERATOR
Tone
f
f
f
f
f
f
f
f
R1
R2
R3
R4
C1
C2
C3
C4
DD
/2 at TNO output (TNOE = 1)
frequency
Standard
1209.0
1336.0
1477.0
1633.0
697.0
770.0
852.0
941.0
(Hz)
frequency (Hz)
Tone output
1206.0
1331.7
1486.5
1639.0
694.8
770.1
854.2
940.0
DD
/2 appears at TNO pin. In STOP
Frequency
deviation
–0.244
–0.324
0.645
0.367
–0.32
–0.11
0.02
0.03
MOTOROLA
TPG
7-5
7