MC68HC11F1 Datasheet, PDF (23/68 Pages) Motorola, Inc – Technical Summary 8-Bit Microcontroller

CWOM — Port C Wired-OR Mode Option
Refer to 7.8 Parallel I/O Registers, page 37.
CLK4X — 4XCLK Output Enable
This bit can only be written once after reset in all modes.
0 = 4XOUT clock output is disabled
1 = Buffered oscillator is driven on the 4XOUT clock output
LIRDV — Load Instruction Register Driven
In order to detect consecutive instructions in a high-speed application, LIR can be driven high for one
quarter of an E-clock cycle during each instruction fetch.
0 = LIR signal is not driven high.
1 = LIR signal is driven high.
Bits 3, 1, 0 — Not implemented. Reads always return zero and writes have no effect.
SPRBYP — See 10.2 SPI Registers, page 52.
OPTION — System Configuration Options
$x039
RESET:
Bit 7
ADPU
0
6
CSEL
0
5
IRQE*
0
4
DLY*
1
3
CME
0
2
FCME*
0
1
CR1*
0
Bit 0
CR0*
0
*Can be written only once in first 64 cycles out of reset in normal modes, or at any time in special modes.
ADPU — A/D Power-Up
This bit is implemented on the MC68HC11F1 only. On the MC68HC11FC0, reads always return zero
and writes have no effect.
0 = A/D system disabled
1 = A/D system enabled
CSEL — Clock Select
This bit is implemented on the MC68HC11F1 only. On the MC68HC11FC0, reads always return zero
and writes have no effect.
0 = A/D and EEPROM use system E clock
1 = A/D and EEPROM use internal RC clock
IRQE — IRQ Select Edge Sensitive Only
0 = Low level recognition
1 = Falling edge recognition
DLY — Enable Oscillator Start-Up Delay on Exit from STOP
0 = No stabilization delay on exit from STOP
1 = Stabilization delay of 4064 E-clock cycles is enabled on exit from STOP
CME — Clock Monitor Enable
0 = Clock monitor disabled; slow clocks can be used
1 = Slow or stopped clocks cause clock failure reset
FCME — Force Clock Monitor Enable
0 = Clock monitor circuit follows the state of the CME bit
1 = Clock monitor circuit is enabled until the next reset
In order to use both STOP and the clock monitor, the CME bit should be written to zero prior to executing
a STOP instruction and rewritten to one after recovery from STOP. FCME should be kept cleared if the
user intends to use the STOP instruction.
CR[1:0] — COP Timer Rate Select
Refer to 5.2 Reset and Interrupt Registers, page 27.
MC68HC11F1/FC0
MC68HC11FTS/D
MOTOROLA
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