参数资料
型号: SAB-C515-RN
厂商: INFINEON TECHNOLOGIES AG
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 16 MHz, MICROCONTROLLER, PQCC68
封装: PLASTIC, LCC-68
文件页数: 104/162页
文件大小: 771K
代理商: SAB-C515-RN
Semiconductor Group
6-3
On-Chip Peripheral Components
C515
6.1.2 Standard I/O Port Circuitry
Figure 6-1 shows a functional diagram of a typical bit latch and I/O buffer, which is the core of each
of the six 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
P4) activate the "read-latch" signal, while others activate the "read-pin" signal.
Figure 6-1
Basic Structure of a Port Circuitry
MCS01822
D
CLK
Port
Latch
Q
Port
Read
Latch
to
Latch
Read
Pin
Write
Int. Bus
Port
Driver
Circuit
Pin
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