参数资料
型号: MC68HC05SB7
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封装: MO-150, SSOP-28
文件页数: 118/170页
文件大小: 2161K
代理商: MC68HC05SB7
August 27, 1998
GENERAL RELEASE SPECIFICATION
MC68HC05SB7
INPUT/OUTPUT PORTS
MOTOROLA
REV 2.1
7-1
SECTION 7
INPUT/OUTPUT PORTS
In normal operating mode there are 19 bidirectional I/O lines arranged as three I/
O ports (Port A, B and C). The individual bits in these ports are programmable as
either inputs or outputs under software control by the data direction registers
(DDRs). All port I/O pins can sink a current of 5mA when programmed as outputs.
7.1
PARALLEL PORTS
Port A, B and C are bidirectional ports. Each port pin is controlled by the corre-
sponding bits in a data direction register and a data register as shown in Figure 7-
Figure 7-1. Port I/O Circuitry
Table 7-1. I/O Pin Functions
R/W
DDR
I/O Pin Functions
0
The I/O pin is in input mode. Data is written into the output data latch.
0
1
Data is written into the output data latch and output to the I/O pin.
1
0
The state of the I/O pin is read.
1
The I/O pin is in an output mode. The output data latch is read.
I/O
PIN
Read Data
Write Data
Data
Register Bit
Internal HC05
Data Bus
Reset
(RST)
Read/Write DDR
Data Direction
Register Bit
OUTPUT
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