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1999 May 10 23
Philips Semiconductors Preliminary specification
Universal Serial Bus (USB) CODEC UDA1325
PORT DEFINITION 80C51
Port 1
Table 13 Port 1 of the 80C51 microcontroller
Port 3
Table 14 Port 3 of the 80C51 microcontroller
8 BIT PORT 1
BIT FUNCTION LOW HIGH COMMENT
1.0 ADAC_error no error error
1.1 GP1 general purpose pins
1.2 GP2
1.3 GP3
1.4 GP4
1.5 GP5
1.6 SCL I
2
C-bus
1.7 SDA
8 BIT PORT 3
BIT FUNCTION LOW HIGH COMMENT
3.0 ASR_error no error error
3.1 PSIE_MMU_SUSPEND no suspend suspend suspend input from USB interface
during normal operation or input from
restart circuit
3.2 GP0 (INT0_N) general purpose pin
3.3 PSIE_MMU_INT (INT1_N) interrupt input from USB interface
during normal operation or input from
restart circuit
3.4 PSIE_MMU_READY
3.5 L3_MODE
3.6 L3_CLK
3.7 L3_DATA