st10f269z1 STMicroelectronics, st10f269z1 Datasheet - Page 74

• 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
When the on-chip peripheral associated with
a Port 3 pin is configured to use both the alternate
input and output function, the descriptions above
apply to the respective current operating mode.
The direction must be set accordingly. Port 3 pins
Figure 28 : Block Diagram of Port 3 Pin with Alternate Input or Alternate Output Function
74/184
Read ODP3.y
Write ODP3.y
Write DP3.y
Open Drain
Read DP3.y
Write DP3.y
Port Output
Read P3.y
Direction
Latch
Latch
Latch
Alternate
Data
Input
MUX
Port Data
Output
1
0
Alternate
Data Output
with alternate input/output functions are: MTSR,
MRST, RxD0 and SCLK.
Note: Enabling the CLKOUT function automati-
&
cally enables the P3.15 output driver. Set-
ting bit DP3.15=’1’ is not required.
Clock
Latch
Input
Output
Buffer
y = 13, 11...0
ST10F269
P3.y