参数资料
型号: M38C29FFAHP
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 5 MHz, MICROCONTROLLER, PQFP64
封装: 10 X 10 MM, 0.50 MM PITCH, PLASTIC, LQFP-64
文件页数: 48/104页
文件大小: 1327K
代理商: M38C29FFAHP
Rev.2.00
May 28, 2004
page 46 of 100
38C2 Group (A Version)
CLOCK OUTPUT FUNCTION
A system clock
φ can be output from I/O port P36.The triple function
of I/O port, timer 2 output function and system clock
φ output function
is performed by the clock output control register (address 001816)
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 P36, set the timer 2
output selection bit and bit 0 of the clock output control register to “1”.
When the clock output function is selected, a clock is output while
the direction register of port P36 is set to the output mode.
P36 is switched to the port output or the output (timer 2 output and
the clock output) except port at the cycle after the timer 2 output
control bit is switched.
Fig. 46 Block diagram of Clock output function
Fig. 45 Structure of clock output control register
Timer 2 latch (8)
Timer 2 (8)
1/2
Q
S
T
T2OUT output
edge switch bit
Timer 2 output control bit
P36 latch
Timer 2 output selection bit
P36 direction register
P36/T2OUT/
φ
System clock
φ
P36 clock output
control bit
b7
b0
Timer 12 mode register (address 002516)
T12M
Timer 2 output selection bit
0: I/O port
1: Timer 2 output
“0”
“1”
“0”
“1”
b0
Not used (returns “0” when read)
(Do not write “1” to these bits.)
P36 clock output control bit
0: Timer 2 output
1: System clock
φ output
Clock output control register
(CKOUT : address 001816)
b7
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