SZF2002 datasheet(55/76 Pages) PHILIPS

55 / 76 page

1998 Aug 26

Philips Semiconductors

Product speciﬁcation

Low voltage 8-bit microcontroller with

6-kbyte embedded RAM

SZF2002

22 DEBUGGING SUPPORT

For software development the SZF2002 is made

compatible with the Nohau 80C51 In-Circuit Emulator

(ICE).

22.1

Recommended equipment

1. Nohau EMUL51-PC/EA768-BSW-42 42 MHz,

768-kbyte emulator memory board.

2. Nohau EMUL51-PC/ATR64-33, 33 MHz, 64-kbyte

advanced trace memory board.

3. Nohau EMUL51-PC/POD-C32HF-42, external

memory mode pod for a.o. 80C51/80C32.

22.2

Connecting the pod

The Nohau In-Circuit Emulator requires the following

80C51 pins: P0.0 to P0.7, P2.0 to P2.7, ALE, PSEN, RD,

WR, EA and RST.

When setting the SZF2002 in Debug mode (force DEBUG

HIGH), these signals become available on the pins as

described in Section 7.2

The connection between the SZF2002 and the emulator is

shown in Fig.27.

For emulation the Target board must be configured with

the SZF2002 mounted, but without external Flash and

RAM, or disabled by disconnecting the OE.

On the Target board a 40-pin connector is required that

has all the necessary 80C51 signals (Port 0, Port 2,

PSEN, ALE, EA, RST, VDD and VSS). The 16 port pins are

optional. The three banking bits are not standard 80C51

signals and are not available at the DIL40

80C51-connector of the pod. These three bits must be

connected via three separate wires to the signals BS0

(LSB), BS1 and BS2 (MSB) on the pod.

The emulator pod has a DIL40 socket for the 80C51

processor (on the upper side). By connecting the 40-pin

connector to this socket the emulator will approach the

SZF2002 as if it were a 80C51. The connector on the lower

side of the pod is not used. The emulator acts as a memory

emulator.

22.3

Powering the pod

Because the SZF2002 is a 3 V circuit, the ICE pod must be

documentation for EMUL51-PC/POD-C32HF-42).

Therefore, VDD and VSS for the SZF2002 are also required.

The clock signal is not required on the pod.

The digital power VDD has to be connected to the pod.

The ground of the pod must be connected to the ground of

the target board via the black gnd-wire soldered to the pod

Because the target supplies the pod the following

power-up/power-down sequence is required:

1. Switch on target.

2. Switch on PC.

3. Switch off target.

When using 3 V power from the target, note that the pod

will drive the inputs up to 3.5 V. Some current will also flow

through the VDD connection to the target. If the emulator is

used together with an I2C-bus interface to a PC or together

with an RS232-connection, use 3.3 V power for the target.

This will reduce noise and disturbance on all input and

output signals. In practice, it is seen that this will result in a

more robust communication between the SZF2002 and

Nohau.

Both I2C-bus pins (SDA and SCL) need an external pull-up

resistor.

22.4

Bank switching support

If bank switching is required, the in-circuit emulator also

needs the TRUE_A15 and the three banking bits

A15 to A17.

16 port pins (selection of Ports 3 and 4) can also be

connected to the emulator pod, however this is not

necessary. When connected, the state of these ports can

be traced.

To set up the banking configuration the BM jumpers on the

emulator board have to be set. The following set-up is

recommended:

1. Jumper BM3 is out.

2. Jumper BM2 is out.

3. Jumper BM1is don’t care.

4. Jumper BM0 is in.

22.5

Software recommendations

The Keil/Franklin assembler and banked linker is well

suited for use with the Nohau ICE (especially for banking

configurations).

The Nohau ICE communicates with the SZF2002 using

MOVX instructions. Therefore, all MOVX instructions must

be forced to access off-chip memory instead of internal

AUX RAM by setting the ARD bit of the SFR PCON.

SZF2002 Datasheet(PDF) 55 Page - NXP Semiconductors

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