参数资料
型号: TSC87C51-L16IEB
厂商: ATMEL CORP
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 16 MHz, MICROCONTROLLER, PQFP44
封装: 1.40 MM HEIGHT, VQFP-44
文件页数: 124/176页
文件大小: 2962K
代理商: TSC87C51-L16IEB
51
2535J–AVR–08/10
ATtiny13
Figure 10-3. Synchronization when Reading an Externally Applied Pin value
Consider the clock period starting shortly after the first falling edge of the system clock. The latch
is closed when the clock is low, and goes transparent when the clock is high, as indicated by the
shaded region of the “SYNC LATCH” signal. The signal value is latched when the system clock
goes low. It is clocked into the PINxn Register at the succeeding positive clock edge. As indi-
cated by the two arrows tpd,max and tpd,min, a single signal transition on the pin will be delayed
between and 1 system clock period depending upon the time of assertion.
When reading back a software assigned pin value, a nop instruction must be inserted as indi-
cated in Figure 10-4 on page 51. The out instruction sets the “SYNC LATCH” signal at the
positive edge of the clock. In this case, the delay tpd through the synchronizer is one system
clock period.
Figure 10-4. Synchronization when Reading a Software Assigned Pin Value
XXX
in r17, PINx
0x00
0xFF
INSTRUCTIONS
SYNC LATCH
PINxn
r17
XXX
SYSTEM CLK
t
pd, max
t pd, min
out PORTx, r16
nop
in r17, PINx
0xFF
0x00
0xFF
SYSTEM CLK
r16
INSTRUCTIONS
SYNC LATCH
PINxn
r17
t
pd
相关PDF资料
PDF描述
TSC87C51-20CBR 8-BIT, OTPROM, 20 MHz, MICROCONTROLLER, PQCC44
TSC87C51-25CIB 8-BIT, OTPROM, 25 MHz, MICROCONTROLLER, CQCC44
TSC87C51-33CBB 8-BIT, OTPROM, 33 MHz, MICROCONTROLLER, PQCC44
TSC87C52-33CDB 8-BIT, OTPROM, 33 MHz, MICROCONTROLLER, PQFP44
T89C51RD2-3CVCM 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PDIP40
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