参数资料
型号: ST62T09CB6
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PDIP20
封装: 0.300 INCH, PLASTIC, DIP-20
文件页数: 41/104页
文件大小: 1487K
代理商: ST62T09CB6
ST6208C/ST6209C/ST6210C/ST6220C
41/104
I/O PORTS (Cont’d)
7.5 REGISTER DESCRIPTION
DATA REGISTER (DR)
Port x Data Register
DRx with x = A or B.
Address DRA: 0C0h - Read /Write
Address DRB: 0C1h - Read /Write
Reset Value: 0000 0000 (00h)
Bits 7:0 = D[7:0] Data register bits.
Reading the DR register returns either the DR reg-
ister latch content (pin configured as output) or the
digital value applied to the I/O pin (pin configured
as input).
Caution: In input mode, modifying this register will
modify the I/O port configuration (see Table 9).
Do not use the Single bit instructions on I/O port
data registers. See (Section 7.2.5).
DATA DIRECTION REGISTER (DDR)
Port x Data Direction Register
DDRx with x = A or B.
Address DDRA: 0C4h - Read /Write
Address DDRB: 0C5h - Read /Write
Reset Value: 0000 0000 (00h)
Bits 7:0 = DD[7:0] Data direction register bits.
The DDR register gives the input/output direction
configuration of the pins. Each bit is set and
cleared by software.
0: Input mode
1: Output mode
OPTION REGISTER (OR)
Port x Option Register
ORx with x = A or B.
Address ORA: 0CCh - Read/Write
Address ORB: 0CDh - Read/Write
Reset Value: 0000 0000 (00h)
Bits 7:0 = O[7:0] Option register bits.
The OR register allows to distinguish in output
mode if the push-pull or open drain configuration is
selected.
Output mode:
0: Open drain output(with P-Buffer deactivated)
1: Push-pull Output
Input mode: See Table 9.
Each bit is set and cleared by software.
Caution: Modifying this register, will also modify
the I/O port configuration in input mode. (see Ta-
Table 11. I/O Port Register Map and Reset Values
70
D7
D6
D5
D4
D3
D2
D1
D0
70
DD7
DD6
DD5
DD4
DD3
DD2
DD1
DD0
70
O7
O6
O5
O4
O3
O2
O1
O0
Address
(Hex.)
Register
Label
7654
3210
Reset Value
of all I/O port registers
00
0
0000
0C0h
DRA
MSB
LSB
0C1h
DRB
0C4h
DDRA
MSB
LSB
0C5h
DDRB
0CCh
ORA
MSB
LSB
0CDh
ORB
1
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