mc68hc05pl4b Freescale Semiconductor, Inc, mc68hc05pl4b Datasheet - Page 67

• Manufacturer Part Number: mc68hc05pl4b
• Description: Low-cost Single-chip Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

11.1
11.2
11.3
MC68HC05PL4
REV 2.0
This section describes Digital-to-Analog module used for DTMF generation.
DAC CONTROL AND DATA REGISTER
DACEN - DAC Channel Enable
DA5-DA0
DAC OPERATION DURING WAIT MODE
In WAIT mode, the DAC continues to output a x ed voltage level which is set by
the DA5-DA0 bits. The DAC should be disabled by clearing the DACEN bit if fur-
ther power saving is required in WAIT mode.
DAC OPERATION DURING STOP MODE
In STOP mode, the DAC continues to output a x ed voltage level which is set by
the DA5-DA0 bits. The DAC should be disabled by clearing the DACEN bit if fur-
ther power saving is required in STOP mode.
DACDR
$000F
Ths read/write bit enables/disables the DAC module for DTMF output.
These bits determine the output voltage of the DAC channel. The output volt-
age value is determined by:
There are 64 evenly spaced voltage levels available between V
lowest voltage is V
reset:
1 = Enable DAC module and con gure P A1/DTMF as DTMF output pin.
0 = Disable DAC module and con gure PA1/DTMF as general purpose
W
R
PA1 pin.
DACEN
BIT 7
0
DIGITAL TO ANALOG CONVERTER
Freescale Semiconductor, Inc.
Figure 11-1. DAC Control and Data Register
For More Information On This Product,
SS
DIGITAL TO ANALOG CONVERTER
BIT 6
0
0
and the highest voltage is 63/64V
Go to: www.freescale.com
V
OUT
SECTION 11
BIT 5
DA5
April 30, 1998
0
= (V
DD
BIT 4
DA4
0
x DA[0:5]) x 2
GENERAL RELEASE SPECIFICATION
BIT 3
DA3
0
6
BIT 2
DA2
DD
0
.
DD
BIT 1
DA1
0
and V
SS
BIT 0
DA0
0
. The
11-1