MC68HC811E2FN Freescale Semiconductor, MC68HC811E2FN Datasheet - Page 102
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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6.8 Parallel I/O Control Register
The parallel handshake functions are available only in the single-chip operating mode. PIOC is a
read/write register except for bit 7, which is read only.
operations.
STAF — Strobe A Interrupt Status Flag
STAI — Strobe A Interrupt Enable Mask Bit
102
Simple
strobed
mode
Full-input
hand-
shake
mode
Full-
output
hand-
shake
mode
Parallel Input/Output (I/O) Ports
STAF is set when the selected edge occurs on strobe A. This bit can be cleared by a read of PIOC with
STAF set followed by a read of PORTCL (simple strobed or full input handshake mode) or a write to
PORTCL (output handshake mode).
0 = No edge on strobe A
1 = Selected edge on strobe A
0 = STAF does not request interrupt
1 = STAF requests interrupt
Read
PIOC with
STAF = 1
then read
PORTCL
Read
PIOC with
STAF = 1
then read
PORTCL
Read
PIOC with
STAF = 1
then write
PORTCL
Sequence
Clearing
STAF
Address:
Reset:
Read:
Write:
HNDS
U = Unaffected
$1002
Figure 6-10. Parallel I/O Control Register (PIOC)
STAF
0
1
1
Bit 7
0
OIN
X
0
1
M68HC11E Family Data Sheet, Rev. 5.1
STAI
Table 6-2. Parallel I/O Control
6
0
0 = STRB
active level
1 = STRB
active pulse
0 = STRB
active level
1 = STRB
active pulse
PLS
X
CWOM
5
0
Follow
DDRC
HNDS
0
1
1
0
0
1
Table 6-2
4
0
Active Edge
Port C
Driven
EGA
STRA
OIN
3
0
shows a summary of handshake
Follow
DDRC
PLS
U
2
Inputs latched into
PORTCL on any
active edge on
STRA
Inputs latched into
PORTCL on any
active edge on
STRA
Driven as outputs if
STRA at active
level; follows
DDRC
if STRA not at
active level
Port B
EGA
1
1
Freescale Semiconductor
INVB
Bit 0
STRB pulses
on writes
to PORTB
Normal output
port, unaffected
in handshake
modes
Normal output
port, unaffected
in handshake
modes
1
Port C
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