TUSB5052 datasheet(17/84 Pages) TI

17 / 84 page

3–5

3.2

Connecting an External Microcontroller for Development

Figure 3–3 illustrates how to connect an external 8052 microcontroller to the TUSB5152. 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 TUSB5152 to the external microcontroller.

Table 3–4. Signals Used for External Microcontroller

TUSB5152

EXTERNAL 8052 MICROCONTROLLER

TUSB5152

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

TSUB5152

8052

LED-1

LED-3

LED-4

LED-2

RSTO

TEST0

P1 (0–7)

P3 (0,1,3,4)

Address (8–10), A15

ALE

P0 (0–7)

P2 (0–2)

INT0

RST

P1 (0–7)

P3 (0–7)

Figure 3–3. Dual LED Connection to LED and SUSP Signals

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