參數(shù)資料
型號(hào)： M38C29FFAFP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, FLASH, 5 MHz, MICROCONTROLLER, PQFP64
封裝： 14 X 14 MM, 0.80 MM PITCH, PLASTIC, LQFP-64
文件頁(yè)數(shù)： 55/104頁(yè)
文件大?。?/td> 1327K
代理商： M38C29FFAFP
Rev.2.00
May 28, 2004
page 52 of 100
38C2 Group (A Version)
Oscillation External Output Function
The 38C2 group has the oscillation external output function to output
the rectangular waveform of the clock obtained by the oscillation cir-
cuits from P41 and P40.
In order to validate the oscillation external output function, set P40 or
P41, or both to the output mode (set the corresponding direction reg-
ister to “ 1” ).
The level of the XCOUT external output signal becomes “H” by the
P40/P41 oscillation output control bits (bits 0 and 1) of the oscillation
output control register (address 0FF016) in the following states;
the function to output the signal from the XCOUT pin externally is
selected
the sub clock (XCIN–XCOUT) is in the stop oscillating or stop mode.
Likewise, the level of the XOUT external output signal becomes “H”
by the P40/P41 oscillation output control bits (bits 0 and 1) of the
oscillation output control register (address 0FF016) in the following
states;
the function to output the signal from the XOUT pin externally is
selected
the main clock (XIN– XOUT) is in the stop oscillating or stop mode.
Fig. 55 Block diagram of Oscillation output function
Fig. 54 Structure of oscillation output control register
Oscillation output control register
P40/P41 oscillation output control bits
b1b0
00: P41, P40 = Normal port
01: P41 = Normal port, P40 = XOUT
10: P41 = Normal port, P40 = XCOUT
11: P41 = XCOUT, P40 = XOUT
Not used (return “ 0”
when read)
(Do not write to “ 1” )
(OSCOUT : address 0FF016)
b7
b0
STP instruction
S
R
Q
XIN
XOUT
Interrupt request
Interrupt disable flag I
Reset
System clock control bits
P61/XCIN
P62/XCOUT
System clock control bits
“01”
System clock control bits
P41/OOUT1
P40/OOUT0
P41 direction register
P40 direction register
OSCOUT control
P41 output latch
P40 output latch
Oscillation
output
selection
circuit
“00”, “10”, “11”
“01”
“00”, “10”, “11”
“00”
“01”, “10”, “11”
s Note
When the signal from the XOUT pin or XCOUT pin of the oscillation
circuit is input directly to the circuit except this MCU and used, the
system operation may be unstabilized.
In order to share the oscillation circuit safely, use the clock output
from P40 and P41 by this function for the circuits except this MCU.
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