MC68HC711E9FU

Manufacturer Part NumberMC68HC711E9FU
ManufacturerFreescale Semiconductor
MC68HC711E9FU datasheet
 


Specifications of MC68HC711E9FU

Cpu FamilyHC11Device Core Size8b
Frequency (max)4MHzInterface TypeSCI/SPI
Program Memory TypeEPROMProgram Memory Size12KB
Total Internal Ram Size512Byte# I/os (max)38
Number Of Timers - General Purpose8Operating Supply Voltage (typ)3.3/5V
Operating Supply Voltage (max)5.5VOperating Supply Voltage (min)3V
On-chip Adc8-chx8-bitInstruction Set ArchitectureCISC
Operating Temp Range0C to 70COperating Temperature ClassificationCommercial
MountingSurface MountPin Count64
Package TypePQFPLead Free Status / Rohs StatusNot Compliant
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6.6 Port E
Port E is used for general-purpose static inputs or pins that share functions with the analog-to-digital (A/D)
converter system. When some port E pins are being used for general-purpose input and others are being
used as A/D inputs, PORTE should not be read during the sample portion of an A/D conversion.
Address:
$100A
Bit 7
Read:
PE7
Write:
Reset:
Alternate Function:
AN7
Figure 6-9. Port E Data Register (PORTE)
6.7 Handshake Protocol
Simple and full handshake input and output functions are available on ports B and C pins in single-chip
mode. In simple strobed mode, port B is a strobed output port and port C is a latching input port. The two
activities are available simultaneously.
The STRB output is pulsed for two E-clock periods each time there is a write to the PORTB register. The
INVB bit in the PIOC register controls the polarity of STRB pulses. Port C levels are latched into the
alternate port C latch (PORTCL) register on each assertion of the STRA input. STRA edge select, flag,
and interrupt enable bits are located in the PIOC register. Any or all of the port C lines can still be used
as general-purpose I/O while in strobed input mode.
Full handshake modes use port C pins and the STRA and STRB lines. Input and output handshake
modes are supported, and output handshake mode has a 3-stated variation. STRA is an edge-detecting
input and STRB is a handshake output. Control and enable bits are located in the PIOC register.
In full input handshake mode, the MCU asserts STRB to signal an external system that it is ready to latch
data. Port C logic levels are latched into PORTCL when the STRA line is asserted by the external system.
The MCU then negates STRB. The MCU reasserts STRB after the PORTCL register is read. In this mode,
a mix of latched inputs, static inputs, and static outputs is allowed on port C, differentiated by the data
direction bits and use of the PORTC and PORTCL registers.
In full output handshake mode, the MCU writes data to PORTCL which, in turn, asserts the STRB output
to indicate that data is ready. The external system reads port C data and asserts the STRA input to
acknowledge that data has been received.
In the 3-state variation of output handshake mode, lines intended as 3-state handshake outputs are
configured as inputs by clearing the corresponding DDRC bits. The MCU writes data to PORTCL and
asserts STRB. The external system responds by activating the STRA input, which forces the MCU to drive
the data in PORTC out on all of the port C lines. After the trailing edge of the active signal on STRA, the
MCU negates the STRB signal. The 3-state mode variation does not allow part of port C to be used for
static inputs while other port C pins are being used for handshake outputs. Refer to the
Control Register
for further information.
Freescale Semiconductor
6
5
4
3
PE6
PE5
PE4
PE3
Indeterminate after reset
AN6
AN5
AN4
AN3
M68HC11E Family Data Sheet, Rev. 5.1
Port E
2
1
Bit 0
PE2
PE1
PE0
AN2
AN1
AN0
6.8 Parallel I/O
101