mc68hc11e0fnr2 Freescale Semiconductor, Inc, mc68hc11e0fnr2 Datasheet - Page 100

• Manufacturer Part Number: mc68hc11e0fnr2
• Description: Hc11 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

PORTCL is used in the handshake clearing mechanism. When an active edge occurs on the STRA pin,
port C data is latched into the PORTCL register. Reads of this register return the last value latched into
PORTCL and clear STAF flag (following a read of PIOC with STAF set).
DDRC[7:0] — Port C Data Direction Bits
6.5 Port D
In all modes, port D bits [5:0] can be used either for general-purpose I/O or with the serial communications
interface (SCI) and serial peripheral interface (SPI) subsystems. During reset, port D pins PD[5:0] are
configured as high-impedance inputs (DDRD bits cleared).
Bits [7:6] — Unimplemented
DDRD[5:0] — Port D Data Direction Bits
100
Parallel Input/Output (I/O) Ports
In the 3-state variation of output handshake mode, clear the corresponding DDRC bits. Refer to
10-13. 3-State Variation of Output Handshake Timing Diagram (STRA Enables Output
Always read 0
When DDRD bit 5 is 1 and MSTR = 1 in SPCR, PD5/SS is a general-purpose output and mode fault
logic is disabled.
0 = Input
1 = Output
0 = Input
1 = Output
Alternate Function:
Address:
Address:
Reset:
Reset:
Read:
Read:
Write:
Write:
Address:
Reset:
Read:
Write:
DDRC7
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Bit 7
Bit 7
I = Indeterminate after reset
0
0
Figure 6-6. Port C Data Direction Register (DDRC)
Figure 6-8. Port D Data Direction Register (DDRD)
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Bit 7
—
—
0
Figure 6-7. Port D Data Register (PORTD)
= Unimplemented
DDRC6
6
0
6
0
M68HC11E Family Data Sheet, Rev. 5.1
—
—
6
0
DDRC5
DDRD5
5
0
5
0
PD5
PD5
SS
5
I
DDRC4
DDRD4
4
0
4
0
SCK
PD4
PD4
4
I
DDRC3
DDRD3
3
0
3
0
MOSI
PD3
PD3
3
I
DDRC2
DDRD2
2
0
2
0
MISO
PD2
PD2
2
I
DDRC1
DDRD1
1
0
1
0
PD1
PD1
Tx
1
I
Freescale Semiconductor
DDRC0
DDRD0
Bit 0
Bit 0
0
0
Bit 0
PD0
PD0
RxD
Buffer).
I
Figure