參數(shù)資料
型號: Q67126-C2088
英文描述: RF inductor, ceramic core, 2% tol, SMT, RoHS
中文描述: 集成電路釤CAN控制器
文件頁數(shù): 36/121頁
文件大?。?/td> 1000K
代理商: Q67126-C2088
Semiconductor Group
6-2
On-Chip Peripheral Components
C501
Figure 6-1
shows a functional diagram of a typical bit latch and I/O buffer, which is the core of each
of the 4 I/O-ports. The bit latch (one bit in the port’s SFR) is represented as a type-D flip-flop, which
will clock in a value from the internal bus in response to a “write-to-latch” signal from the CPU. The
Q output of the flip-flop is placed on the internal bus in response to a “read-latch” signal from the
CPU. The level of the port pin itself is placed on the internal bus in response to a “read-pin” signal
from the CPU. Some instructions that read from a port (i.e. from the corresponding port SFR P0 to
P3) activate the “read-latch” signal, while others activate the “read-pin” signal.
Figure 6-4
Basic Structure of a Port Circuitry
MCS01822
D
CLK
Port
Latch
Q
Q
Port
Pin
Read
Latch
to
Latch
Read
Pin
Write
Int. Bus
Port
Driver
Circuit
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