MC68HC811E2FN Freescale Semiconductor, MC68HC811E2FN Datasheet - Page 137
MC68HC811E2FN
Manufacturer Part Number
MC68HC811E2FN
Description
Manufacturer
Freescale Semiconductor
Datasheet
1.MC68HC811E2FN.pdf
(242 pages)
Specifications of MC68HC811E2FN
Cpu Family
HC11
Device Core Size
8b
Frequency (max)
4MHz
Interface Type
SCI/SPI
Program Memory Type
ROMLess
Program Memory Size
Not Required
Total Internal Ram Size
256Byte
# I/os (max)
38
Number Of Timers - General Purpose
8
Operating Supply Voltage (typ)
3.3/5V
Operating Supply Voltage (max)
5.5V
Operating Supply Voltage (min)
3V
On-chip Adc
8-chx8-bit
Instruction Set Architecture
CISC
Operating Temp Range
0C to 70C
Operating Temperature Classification
Commercial
Mounting
Surface Mount
Pin Count
52
Package Type
PLCC
Lead Free Status / Rohs Status
Supplier Unconfirmed
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9.4.5 Timer Counter Register
The 16-bit read-only TCNT register contains the prescaled value of the 16-bit timer. A full counter read
addresses the most significant byte (MSB) first. A read of this address causes the least significant byte
(LSB) to be latched into a buffer for the next CPU cycle so that a double-byte read returns the full 16-bit
state of the counter at the time of the MSB read cycle.
9.4.6 Timer Control Register 1
The bits of this register specify the action taken as a result of a successful OCx compare.
OM[2:5] — Output Mode Bits
OL[2:5] — Output Level Bits
Freescale Semiconductor
These control bit pairs are encoded to specify the action taken after a successful OCx compare. OC5
functions only if the I4/O5 bit in the PACTL register is clear. Refer to
Register name: Timer Counter Register (High)
Register name: Timer Counter Register (Low)
Address:
Reset:
Reset:
Reset:
Read:
Read:
Read:
Write:
Write:
Write:
$1020
Bit 15
OM2
Bit 7
Bit 7
Bit 7
Bit 7
OMx
0
0
0
0
0
1
1
Figure 9-16. Timer Control Register 1 (TCTL1)
Figure 9-15. Timer Counter Register (TCNT)
Table 9-3. Timer Output Compare Actions
= Unimplemented
OLx
Bit 14
Bit 6
OL2
0
1
0
1
0
0
6
6
6
0
M68HC11E Family Data Sheet, Rev. 5.1
Timer disconnected from output pin logic
Toggle OCx output line
Clear OCx output line to 0
Set OCx output line to 1
Bit 13
OM3
Bit 5
5
0
5
0
5
0
Action Taken on Successful Compare
Address: $100F
Address: $100E
Bit 12
Bit 4
OL3
4
0
4
0
4
0
Bit 11
OM4
Bit 3
3
0
3
0
3
0
Bit 10
Bit 2
OL4
2
0
2
0
2
0
Table 9-3
OM5
Bit 9
Bit 1
1
0
1
0
1
0
for the coding.
Bit 0
Bit 8
Bit 0
Bit 0
Bit 0
OL5
0
0
0
Output Compare
137
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