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ST63140 数据表(PDF) 29 Page - STMicroelectronics

部件名 ST63140
功能描述  8-BIT HCMOS MCUs FOR TV FREQUENCY & VOLTAGE SYNTHESIS WITH OSD
PDF  86 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

ST63140 数据表(HTML) 29 Page - STMicroelectronics

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DDR
DR
Mode
Option
0
0
Input
With on-chip pull-up
resistor
0
1
Input
Without on-chip pull-up
resistor
1
X
Output
Open-drain or Push-Pull
Note: X: Means don’t care.
Table 8. I/O Port Options Selection
DRA, DRB, DRC
Port A, B, C Data Register
( C0h PA, C1h PB, C2h PC Read/ Write )
D7 D6 D5 D4 D3 D2 D1 D0
PA0 - PA7 = Data Bits
PB0 - PB7 = Data Bits
PC0 - PC7 = Data Bits
Figure 24. Port A, B, C Data Register
DDRPA, DDRPB,DDRPC
Port A, B, C Data Direction Register
( C4h PA, C5h PB, C6h PC Read/ Write )
D7 D6 D5 D4 D3 D2 D1 D0
PA0 - PA7 = Data Direction Bits
PB0 - PB7 = Data Direction Bits
PC0 - PC7 = Data Direction Bits
“0” Defines bit as Inpu t
”1” Defines bit as Outpu t
Figure 25. Port A, B, C Data Direction Register
INPUT/OUTPUT PORTS (Continued)
PA7-PA0. These are the I/O port A data direction
bits. When a bit is cleared to zero the related I/O
line is in input mode, if bit is set to one the related
I/O line is in output mode. Reset at power-on.
PB7-PB0. These are the I/O port B data direction
bits. When a bit is cleared to zero the related I/O
line is in input mode, if bit is set to one the related
I/O line is in output mode. Reset at power-on.
PC7-PC0. These are the I/O port C data direction
bits. When a bit is cleared to zero the related I/O
line is in input mode, if bit is set to one the related
I/O line is in output mode. Set to 04h at power-on.
Bit 2 (PC2 pin) is set to one (output mode selected)
as this line is intended for TV ON-OFF switching.
I/O Pin Programming
Each pin can be individually programmed as input or
output with different input and output configurations.
This is achieved by writing to the relevant bit in the
data (DR) and data direction register (DDR). Table
8 shows all the port configurations that can be se-
lected by the user software.
PA7-PA0. These are the I/O port A data bits. Reset
at power-on.
PB7-PB0. These are the I/O port B data bits. Reset
at power-on.
PC7-PC0. These are the I/O port C data bits. Reset
at power-on.
®
ST63140,142,126,156
25/82



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