MC68HC05B4 Datasheet, PDF (95/298 Pages) Motorola, Inc – High-density Complementary Metal Oxide Semiconductor (HCMOS) Microcomputer Unit

7
PULSE LENGTH D/A CONVERTERS
The pulse length D/A converter (PLM) system works in conjunction with the timer to execute two
8-bit D/A conversions, with a choice of two repetition rates. (See Figure 7-1.)
Data bus
8
8
PLMA
PLMB
register
register
7
‘A’ register
buffer
‘B’ register
buffer
‘A’
comparator
‘B’
comparator
PLMA
D/A
pin
R
Latch
S
R
Latch
S
PLMB
D/A
pin
Zero detector
SFA
bit
8
‘A’
multiplexer
16
Zero detector
8
‘B’
SFB
multiplexer
bit
16
Timer bus
Figure 7-1 PLM system block diagram
MC68HC05B6
Rev. 4
PULSE LENGTH D/A CONVERTERS
From timer
TPG
MOTOROLA
7-1