Motorola MC68HC05RC8 User Manual
Carrier Modulator Transmitter (CMT)
General Release Specification
MC68HC05RC16 — Rev. 3.0
72
Carrier Modulator Transmitter (CMT)
MOTOROLA
9.4.2 Carrier Generator Data Registers (CHR1, CLR1, CHR2, and CLR2)
The carrier generator contains two, 7-bit data registers: primary high
time (CHR1), primary low time (CLR1); and two, 6-bit data registers:
secondary high time (CHR2) and secondary low time (CLR2). Bit 7 of
CHR1 and CHR2 is used to read and write the IRO latch.
time (CHR1), primary low time (CLR1); and two, 6-bit data registers:
secondary high time (CHR2) and secondary low time (CLR2). Bit 7 of
CHR1 and CHR2 is used to read and write the IRO latch.
Address:
$0010
Bit 7
6
5
4
3
2
1
Bit 0
Read:
IROLN
0
PH5
PH4
PH3
PH2
PH1
PH0
Write:
Reset:
0
0
U
U
U
U
U
U
U = Unaffected
Figure 9-3. Carrier Generator Data Register CHR1
Address:
$0011
Bit 7
6
5
4
3
2
1
Bit 0
Read:
IROLP
0
PL5
PL4
PL3
PL2
PL1
PL0
Write:
Reset:
0
0
U
U
U
U
U
U
U = Unaffected
Figure 9-4. Carrier Generator Data Register CLR1
Address:
$0012
Bit 7
6
5
4
3
2
1
Bit 0
Read:
0
0
SH5
SH4
SH3
SH2
SH1
SH0
Write:
Reset:
0
0
U
U
U
U
U
U
U = Unaffected
Figure 9-5. Carrier Generator Data Register CHR2