t81l0003b TM Technology Inc., t81l0003b Datasheet - Page 9

• Manufacturer Part Number: t81l0003b
• Description: 8-bit Mcu
• Manufacturer: TM Technology Inc.

8.2. External Register Table ( for LVR, High/ Normal Driving)
Note :
* LVR (Low Voltage Reset) address : 802bH, read/write
** Port I/O high driving set
Port 3 high driving address : 8030H
Port 1 high driving address : 8032H
8.3. I/O Ports
Port1
device inputs. When port 1 pins are written as 1’s, these pins are pulled high by the internal pull-ups and can be used as
inputs. As inputs, Port 1 pins that are externally being pulled low will source current because of the internal pull-ups.
Port 3
device inputs. When port 3 pins are written as 1’s, these pins are pulled high by the internal pull-ups and can be used as
inputs. As inputs, Port 3 pins that are externally being pulled low will source current because of the internal pull-ups.
TM Technology Inc. reserves the right
to change products or specifications without notice.
tm
LVR[7]
Port1.7
MSB
MSB
MSB
100… 0010 1011
100… 0011 0000
100… 0011 0010
Bit 7
Bit 7
Bit 7
if write ‘0’ = set I/O to high driving current mode.
if write ‘1’ = set I/O to normal driving current mode.
default is set ‘1’.
A15…A5-A0
LVR[7] : if LVR[7] write ‘1’, low voltage reset function enable.
LVR[6] : if LVR[6] write ‘1’= 2.1V reset. if LVR[6] write ‘0’= 2.8V reset.
Port 1 is an 8-bit bi-directional I/O port with internal pull-ups. Port 1 output buffers can sink/source four external TTL
Port 3 is an 8-bit bi-directional I/O port with internal pull-ups. Port 3 output buffers can sink/source four external TTL
Port 3 also serves the functions of various special features, as listed below:
P3.0 RXD (serial input port)
P3.1 TXD (serial output port)
P3.2 INT0 (external interrupt 0)
P3.3 INT1 (external interrupt 1)
P3.4 T0 (timer 0 external input)
Register Address
CH
LVR[6]
Port1.6
TE
default is ‘0’, low voltage reset function disable.
default is ‘0’= 2.8V reset.
Bit 6
Bit 6
Bit 6
802bH
8030H
8032H
Hex
Port1.5
Bit5
Bit5
Bit5
Port3 HDS Port3 I/O high driving set**
Port1 HDS Port1 I/O high driving set**
PWMC2
Name
Port3.4
Port1.4
Bit 4
Bit 4
Bit 4
LVR (Low Voltage Reset)*
Port3.3
Port1.3
Bit 3
Bit 3
Bit 3
P. 9
Reserved
Port3.2
Port1.2
Bit 2
Bit 2
Bit 2
Comments
Port3.1
Port1.1
Publication Date: NOV. 2005
Bit1
Bit1
Bit1
T81L0003B
Port3.0
Port1.0
Bit 0
Bit 0
Bit 0
LSB
LSB
LSB
Revision:A