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参数资料
型号： M38D59GC-XXXFP
元件分类： 微控制器/微处理器
英文描述： 8-BIT, MROM, 6.25 MHz, MICROCONTROLLER, PQFP80
封装： 14 X 20 MM, 0.80 MM PITCH, PLASTIC, QFP-80
文件页数： 100/142页
文件大小： 2004K
代理商： M38D59GC-XXXFP
Rev.3.04
May 20, 2008
Page 60 of 134
REJ03B0158-0304
38D5 Group
CLOCK OUTPUT FUNCTION
A system clock
φ can be output from I/O port P72. The triple
function of I/O port, timer 2 output function and system clock
φ
output function are controlled by the clock output control register
(address 0FF316) and the timer 2 output selection bit of the timer
12 mode register (address 002516).
In order to output a system clock
φ from I/O port P72, set the
timer 2 output selection bit to “1” and P72 clock output control
bits of the clock output control register to “01”. In order to output
the same signal as oscillation frequency of sub clock XCIN, set
the P72 clock output control bits to “10”. When the clock output
function is selected, a clock is output while the direction register
of port P72 is set to the output mode.
P72 is switched to the port output or the output (timer 2 output or
the clock output) except port at the cycle after the timer 2 output
selection bit is switched.
Fig. 54 Structure of clock output control register
Fig. 55 Block diagram of Clock output function
Other function registers
[RRF register (RRFR)]
The RRF register (address 001216) is the 8-bit register and does
not have the control function.
As for the value written in this register, high-order 4 bits and
low-order 4 bits interchange.
It is initialized after reset.
Fig. 56 Structure of RRF register
b7
b0
Clock output control register
(CKOUT : address 0FF316)
P72 clock output control bits
b1b0
0 0: Timer 2 output
0 1:
φ frequency signal output
1 0: XCIN frequency signal output
1 1: Not available
Not used (returns “0” when read)
Timer 2 latch (8)
Timer 2 (8)
1/2
Q
S
T
T2OUT output edge
switch bit
“0”
“1”
P72 latch
Timer 2 output selection bit
P72 direction register
P72/T2OUT/CKOUT
b7
b0
Timer 12 mode register (address 002516)
T12M
Timer 2 output selection bit
0 : I/O port
1 : Timer 2 output
System clock
φ
Timer 2 output selection bit
XCIN
“00”
“01”
“10”
P72 clock output
control bits
b7
b0
RRF register
DB4 data storage
DB5 data storage
DB6 data storage
DB7 data storage
DB0 data storage
DB1 data storage
DB2 data storage
DB3 data storage
(RRFR : address 001216)
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