TUSB5052 datasheet(17/82 Pages) TI

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3−5

3.2

Connecting an External Microcontroller for Development

Figure 3−3 illustrates how to connect an external 8052 microcontroller to the TUSB5052. Pin TEST0 must be

connected to ground to enable the external mode (TEST[2:0] = 110b). Table 3−4 outlines the signals used to connect

the TUSB5052 to the external microcontroller.

Table 3−4. Signals Used for External Microcontroller

TUSB5052

EXTERNAL 8052 MICROCONTROLLER

TUSB5052

NAME

COMMENTS

P1.0

P0.0

Port-0: Bit-0 data bus

P1.1

P0.1

Port-0: Bit-1 data bus

P1.2

P0.2

Port-0: Bit-2 data bus

P1.3

P0.3

Port-0: Bit-3 data bus

P1.4

P0.4

Port-0: Bit-4 data bus

P1.5

P0.5

Port-0: Bit-5 data bus

P1.6

P0.6

Port-0: Bit-6 data bus

P1.7

P0.7

Port-0: Bit-7 data bus

P3.0

P2.0

Address line A8

P3.1

P2.1

Address line A9

P3.3

P2.2

Address line A10

P3.4

P2.7

Address line A15

LED-1

ALE

Address latch enable

LED-2

INTO

Interrupt input to microcontroller

LED-3

External data memory write strobe

LED-4

External data memory read strobe

RSTO

RST

Master reset input

TUSB5052

8052

LED-1

LED-3

LED-4

LED-2

RSTO

TEST0

P1.[7:0]

P3.[4,3,1,0]

Address Lines A8, A9, A10, A15

ALE

P0.[7:0]

P2.[7,2,1,0]

INT0

RST

P1[7:0]

P3[4:0]

Figure 3−3. Connecting to an External Microcontroller

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