SH79F6488PSLASH080PR datasheet(43/152 Pages) SINOWEALTH

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SH79F6488/SH79F6489

7.7.4 Port Share

The 72 bi-directional I/O ports can also share second or third special function. But the share priority should obey the Outer

Most Inner Lest rule:

The out most pin function in Pin Configuration has the highest priority, and the inner most pin function has the lowest priority.

This means when one pin is occupied by a higher priority function (if enabled), it cannot be used as the lower priority functional

pin, even the lower priority function is also enabled. Only until the higher priority function is closed by hardware or software, can

the corresponding pin be released for the lower priority function use. Also the function that need pull up resister is also

controlled by the same rule.

When port share function is enabled, the user can modify PxCR, PxPCR (x = 0-8), but these operations will have no effect on

the port status until the second function was disabled.

When port share function is enabled, any read or write operation to port will only affect the data register while the port pin keeps

unchanged until all the share functions are disabled.

PORT0:

- RXD/INT46/T2 (P0.0): EUART data input/external inturrupt46/Timer2 external input/baud-rate clock output

- TXD/INT47/T3 (P0.1): EUART data output/external inturrupt47/Timer3 external input

- D+ (P0.2): USB differential data Positive input/output (for SH79F6489)

- D - (P0.3): USB differential data Negative input/output (for SH79F6489)

- T2EX/INT0 (P0.4): Timer2 reload/capture control / external inturrupt0

- INT1 (P0.5): external inturrupt1

- INT2 (P0.6): external inturrupt2

- INT3 (P0.7): external inturrupt3

Table 7.24 PORT0 Share Table

Pin No.

Priority Function

Enable bit

PAD

LQFP64 LQFP80

TXD

When Write to SBUF Register

Set TR2 bit and C/T

----

bit in T2CON register (Auto Pull up) or clear C/T

----

bit and set T2OE bit in T2MOD register

INT46

Set EX46 bit in IENC register, P0.0 in input mode

P0.0

Above condition is not met

RXD

Set REN bit in SCON Register (Auto Pull up)

Set TR3 bit in T3CON register and T3CLKS[1:0] = 01 (Auto Pull up)

INT47

Set EX47 bit in IENC register, P0.1 in input mode

P0.1

Above condition is not met

D+

Set ENUSB bit in USBCON register (for SH79F6489)

P0.2

Above condition is not met

D-

Set ENUSB bit in USBCON register (for SH79F6489)

P0.3

Above condition is not met

T2EX

In mode0, 2, 3, set EXEN2 bit in T2CON register, or in mode 1 set

DCEN bit in T2CON register or in mode1, clear DCEN bit and set

EXEN2 bit (Auto Pull up)

INT0

Set EX0 bit in IEN0 Register and Port0.4 is in input mode

P0.4

Above condition is not met

INT1

Set EX1 bit in IEN0 Register and Port0.5 is in input mode

P0.5

Above condition is not met

INT2

Set EX2 bit in IEN1 Register and Port0.6 is in input mode

P0.6

Above condition is not met

INT3

Set EX3 bit in IEN1 Register and Port0.7 is in input mode

P0.7

Above condition is not met

SH79F6488P/080PR Datasheet(PDF) 43 Page - SINOWEALTH Electronic Ltd

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