SH7041A datasheet(484/923 Pages) RENESAS

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12.10

POE Register Descriptions

12.10.1

Input Level Control/Status Register (ICSR)

The input level control/status register (ICSR) is a 16-bit read/write register that selects the

POE0–

POE3 pin input modes, controls the enable/prohibit of interrupts, and indicates status. If any of the

POE3F–POE0F bits are set to 1, the high current pins become high impedance state.

ICSR is initialized to H'0000 by power-on resets; however, it is not initialized for manual resets,

standby mode, or sleep mode, so the previous data is maintained.

Bit:

POE3F

POE2F

POE1F

POE0F

—

PIE

Initial value:

R/W:

R/(W)*

RRR

R/W

Bit:

POE3M1 POE3M0 POE2M1 POE2M0 POE1M1 POE1M0 POE0M1 POE0M0

Initial value:

R/W:

R/W

Note: * Only 0 writes are possible to clear the flags.

• Bit 15—POE3 Flag (POE3F): This flag indicates that a high impedance request has been input

to the

POE3 pin.

Bit 15: POE3F

Description

Clear condition: By writing 0 to POE3F after reading a POE3F = 1

(initial value)

Set condition: When the input set by ICSR bits 7 and 6 occurs at

the

POE3 pin

• Bit 14—POE2 Flag (POE2F): This flag indicates that a high impedance request has been input

to the

POE2 pin.

Bit 14: POE2F

Description

Clear condition: By writing 0 to POE2F after reading a POE2F = 1

(initial value)

Set condition: When the input set by ICSR bits 5 and 4 occurs at

the

POE2 pin

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