參數(shù)資料
型號(hào)： MC68HC11A8BCFN2
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PQCC52
封裝： PLASTIC, LCC-52
文件頁數(shù)： 157/158頁
文件大?。?/td> 3803K
代理商： MC68HC11A8BCFN2
RESETS, INTERRUPTS, AND LOW POWER MODES
MC68HC11A8
9-18
TECHNICAL DATA
9
the actual recovery sequence differs depending on the state of the X bit. If the X bit is
clear, the MCU starts up with the stacking sequence leading to normal service of the
XIRQ request. If the X bit is set, then processing will continue with the instruction im-
mediately following the STOP instruction and no XIRQ interrupt service routine is re-
quested. A reset will always result in an exit from the STOP mode, and the start of
MCU operation is determined by the reset vector.
SYMBOLS:
DATA
=Current data present.
I
=Input pin, if ( ) associated then this is required input state.
l/O
=Input/output pin, state determined by data direction register.
Hl ADD
=High byte of the address.
LO ADD
=Low byte of the address.
ADD/DATA =Low byte of the address multiplexed with data.
OD
=Open drain output, ( ) current output state.
SS
=Steady state, output pin stays in current state.
SP-8
=Address output during WAI period following WAI instruction, stack point-
er value, at time of WAI, minus 8.
!!!
=XTAL is output but not normally usable for any output function beyond
crystal drive.
Since the oscillator is stopped in the STOP mode, a restart delay of 4064 clock cycle
times may be required to allow oscillator stabilization. If the internal oscillator is being
used, this delay is required; however, if a stable external oscillator is being used, a
control bit in the OPTION register may be used (DLY = 0) to give a delay of four cycles.
Table 9-7 Pin State Summary for RESET, STOP, and WAIT
Pins
Single Chip Modes
Expanded Modes
RESET
WAIT
STOP
RESET
WAIT
STOP
Output Only
E
Active E
0
Active E
0
XTAL!!!
Active
1
Active
1
STRB/RW
0
SS
1
PA3-PA6
0
SS
0
SS
PB0-PB7
0
SS
Hl ADD
Input/Output
RESET
I (0)
I
I (0)
I
MODA/LIR
I (0)
OD (1)
I (1)
OD (1)
MODB/VSTBY
I (MODB)
l (VSTBY)
I (MODES)
l (VSTBY)
STRA/AS
I (STRA)
Active AS
0
PA7
I
I/O
I
l/O
I/O
PC0-PC7
I
I/O
ADD/DATA SP-8/DATA
LO ADD
PD0-PD5
I
I/O
I
I/O
Input Only
EXTAL
Input Clock or Connect to Crystal with XTAL
IRQ
Terminate Unused Inputs to VDD
XIRQ
Terminate Unused Inputs to VDD
PA0-PA2
Terminate Unused Inputs to VDD or VSS
PE0-PE7
If Not Used, External Drive Not Required
VRH-VRL
If Not Used, External Drive Not Required
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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