st10f269z1 STMicroelectronics, st10f269z1 Datasheet - Page 84

• Manufacturer Part Number: st10f269z1
• Description: St10f269 16-bit Mcu With Mac Unit, 256k Byte Flash Memory And 12k Byte Ram
• Manufacturer: STMicroelectronics

12 - PARALLEL PORTS
The chip select lines of Port 6 have an internal
weak pull-up device. This device is switched on
during reset. This feature is implemented to drive
the chip select lines high during reset in order to
avoid multiple chip selection.
After reset the CS function must be used, if
selected so. In this case there is no possibility to
program any port latches before. Thus the
Figure 37 : Block Diagram of Port 6 Pins with an Alternate Output Function
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Read ODP6.y
Write ODP6.y
Write DP6.y
Open Drain
Read DP6.y
Write DP6.y
Port Output
Read P6.y
Direction
Latch
Latch
Latch
MUX
1
0
Alternate
Data
Output
Alternate
Function
Enable
"1"
alternate function (CS) is selected automatically in
this case.
Note: The open drain output option can only be
"0"
1
0
1
0
MUX
MUX
selected via software earliest during the
initialization routine; at least signal CS0
will be in push/pull output driver mode
directly after reset.
1
0
MUX
MUX
Clock
Latch
Input
Output
Buffer
y = (0...4, 6, 7)
ST10F269
P6.y