参数资料
型号: M38D29FFFP
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 6.25 MHz, MICROCONTROLLER, PQFP64
封装: 14 X 14 MM, 0.80 MM PITCH, PLASTIC, LQFP-64
文件页数: 90/136页
文件大小: 2856K
代理商: M38D29FFFP
Rev.3.02
Apr 10, 2008
Page 57 of 131
REJ03B0177-0302
38D2 Group
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 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 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. 53 Structure of clock output control register
Fig. 54 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. 55 Structure of RRF register
b7
b0
Clock output control register
(CKOUT : address 0FF316)
P36 clock output control bit
0 : Timer 2 output
1 : System clock
φ output
Not used (returns “0” when read)
Not used (Do not write “1” to these bits.)
Timer 2 latch (8)
Timer 2 (8)
1/2
Q
S
T
T2OUT output edge
switch bit
P36 clock output control bit
“0”
“1”
P36 latch
Timer 2 output selection bit
P36 direction register
P36/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 control bit
“0”
“1”
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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