参数资料
型号: SAF-C515-LN
厂商: INFINEON TECHNOLOGIES AG
元件分类: 微控制器/微处理器
英文描述: 8-BIT, 16 MHz, MICROCONTROLLER, PQCC68
封装: PLASTIC, LCC-68
文件页数: 100/162页
文件大小: 771K
代理商: SAF-C515-LN
Semiconductor Group
5-6
Reset / System Clock
C515
5.4
System Clock Output
For peripheral devices requiring a system clock, the C515 provides a clock output signal derived
from the oscillator frequency as an alternate output function on pin P1.6/CLKOUT. lf bit CLK is set
(bit 6 of special function register ADCON), a clock signal with 1/12 of the oscillator frequency is
gated to pin P1.6/CLKOUT. To use this function the port pin must be programmed to a one (1),
which is also the default after reset.
Special Function Register ADCON (Address D8H)
Reset Value : 00X000000B
The system clock is high during S3P1 and S3P2 of every machine cycle and low during all other
states. Thus, the duty cycle of the clock signal is 1:6. Associated with a MOVX instruction the
system clock coincides with the last state (S3) in which a RD or WR signal is active. A timing
diagram of the system clock output is shown in figure 5-6.
Note : During slow-down operation the frequency of the CLKOUT signal is divided by 8.
Bit
Function
CLK
Clockout enable bit
When set, pin P1.6/CLKOUT outputs the system clock which is 1/12 of the
oscillator frequency.
Reserved bit for future use. Read by CPU returns undefined value.
BD
CLK
BSY
D8H
ADCON
Bit No.
DFH
DEH
DDH
DCH
DBH
DAH
D9H
D8H
MSB
LSB
ADM
MX2
MX1
MX0
The shaded bits are not used for clock output control.
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SAH-C515-LN 8-BIT, 16 MHz, MICROCONTROLLER, PQCC68
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