参数资料
型号: SAB-C515-LM
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, PQFP80
封装: PLASTIC, MQFP-80
文件页数: 113/162页
文件大小: 771K
代理商: SAB-C515-LM
Semiconductor Group
6-11
On-Chip Peripheral Components
C515
6.1.3 Port Timing
When executing an instruction that changes the value of a port latch, the new value arrives at the
latch during S6P2 of the final cycle of the instruction. However, port latches are only sampled by
their output buffers during phase 1 of any clock period (during phase 2 the output buffer holds the
value it noticed during the previous phase 1). Consequently, the new value in the port latch will not
appear at the output pin until the next phase 1, which will be at S1P1 of the next machine cycle.
When an instruction reads a value from a port pin (e.g. MOV A, P1) the port pin is actually sampled
in state 5 phase 1 or phase 2 depending on port and alternate functions. Figure 6-8 illustrates this
port timing. It must be noted that this mechanism of sampling once per machine cycle is also used
if a port pin is to detect an "edge", e.g. when used as counter input. In this case an "edge" is
detected when the sampled value differs from the value that was sampled the cycle before.
Therefore, there must be met certain reqirements on the pulse length of signals in order to avoid
signal "edges" not being detected. The minimum time period of high and low level is one machine
cycle, which guarantees that this logic level is noticed by the port at least once.
Figure 6-8
Port Timing
MCT03231
P1
P2
S4
S5
P2
P1
S6
P2
P1
S1
P2
P1
S2
P2
P1
S3
P2
P1
XTAL2
Input sampled:
e.g. MOV A, P1
Old Data
New Data
Port
P1 active for 1 State
(driver transistor)
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