PSD813F2 Datasheet

IC型号：
PSD813F2
PDF描述：
FLASH IN-SYSTEM PROGRAMMABLE (ISP) PERIPHERALS FOR 8-BIT MCU...
文件大小：
1180.57KB
芯片厂家：
STMicroelectronics

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PSD8XX Family

PSD835G2

9.4.3.1 Control Register

Any bit set to 鈥?鈥?in the Control Register sets the corresponding Port pin to MCU I/O Mode,

and a 鈥?鈥?sets it to Address Out Mode. The default mode is MCU I/O. Only Ports E, F and

G have an associated Control Register.

9.4.3.2 Direction Register

The Direction Register controls the direction of data flow in the I/O Ports. Any bit set to 鈥?鈥?/div>

in the Direction Register will cause the corresponding pin to be an output, and any bit set

to 鈥?鈥?will cause it to be an input. The default mode for all port pins is input.

Figures 26 and 28 show the Port Architecture diagrams for Ports A/B/C and E/F/G

respectively. The direction of data flow for Ports A, B, C and F are controlled not only by

the direction register, but also by the output enable product term from the PLD AND array.

If the output enable product term is not active, the Direction Register has sole control of a

given pin鈥檚 direction.

An example of a configuration for a port with the three least significant bits set to output

and the remainder set to input is shown in Table 22. Since Port D only contains four pins,

the Direction Register for Port D has only the four least significant bits active.

The

PSD835G2

Functional

Blocks

(cont.)

Table 20. Port Pin Direction Control,

Output Enable P.T. Not Defined

Direction Register Bit

Port Pin Mode

Input

Output

Table 21. Port Pin Direction Control, Output Enable P.T. Defined

Direction Register Bit

Output Enable P.T.

Port Pin Mode

Input

Output

Table 22. Port Direction Assignment Example

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

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