psd813f1a-90ut STMicroelectronics, psd813f1a-90ut Datasheet - Page 47

• Manufacturer Part Number: psd813f1a-90ut
• Description: Flash In-system Programmable Isp Peripherals For 8-bit Mcus
• Manufacturer: STMicroelectronics

The
PSD913F1
Functional
Blocks
(cont.)
46
PSD913F1
9.4.2 Port Operating Modes
The I/O Ports have several modes of operation. Some modes can be defined in
PSDsoft, some by the microcontroller writing to the Control Registers in CSIOP space, and
some by both. The modes that can only be defined using PSDsoft must be
programmed into the device and cannot be changed unless the device is reprogrammed.
The modes that can be changed by the microcontroller can be done so dynamically
at run-time. The PLD I/O, Data Port, and Address Input, are the only modes that must
be defined before programming the device. All other modes can be changed by the
microcontroller at run-time.
Table 17 summarizes which modes are available on each port. Table 20 shows how and
where the different modes are configured. Each of the port operating modes are described
in the following subsections.
Table 17. Port Operating Modes
MCU I/O
PLD Outputs
PLD Inputs
Address Out
Address In
Data Port
JTAG ISP
Port Mode
Yes
Yes
Yes
Yes (A7 – 0)
Yes
Yes (D7 – 0)
No
Port A
Yes
Yes
Yes
Yes (A7 – 0)
or A15 – 8)
Yes
No
No
Port B
Port C
Yes
No
Yes
No
Yes
No
Yes
Port D
Preliminary
Yes
Yes
Yes
No
Yes
No
No