TMP89FS60 datasheet(387/410 Pages) TOSHIBA

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Page 373

TMP89FS60

RA000

23. On-chip Debug Function (OCD)

The TMP89FS60 has an on-chip debug function. Using a combination of this function and the TOSHIBA on-chip

debug emulator RTE870/C1, the user is able to perform software debugging in the on-board environment. This emu-

lator can be operated from a debugger installed on a PC so that the emulation and debugging functions of an applica-

tion program can be used to modify a program or for other purposes.

This chapter describes the control pins needed to use the on-chip debug function and how a target system is con-

nected to the on-chip debug function. For more detailed information on how to use the on-chip debug emulator

RTE870/C1, refer to the emulator operating manual.

23.1 Features

The on-chip debug function of the TMP89FS60 has the following features:

• Debugging can be performed in much the same way as when a microcontroller packaged with the MCU is

used.

• The debugging function can be realized using two communication control pins.

• Useful on-chip debug functions include the following:

- 8 breaks function are provided (one of which can also be used as an event function).

- A trace function that allows the newest two branch instructions to be stored in real time is provided.

- Functions to display active memory and to overwrite active memory are provided.

• Built-in flash memory can be erased and written.

23.2 Control Pins

The on-chip debug function uses two pins for communication and four pins for power supply, reset and mode con-

trol. The pins used for the on-chip debug function are shown in Table 23-1.

Ports P20 and P21 are used as communication control pins of the on-chip debug function. If the on-chip debug

emulator RTE870/C1 is used, therefore, the port functions and the functions of UART0 and SIO0, which are also

used as ports, cannot be debugged.

Note 1: To use all on-chip debug functions, the power supply voltage must be within the range 4.5 V to 5.5 V. If it is within the range

2.7 V to 4.5 V, functional limitations occur with some of the debug functions. For more detailed information, refer to the

emulator operating manual.

Table 23-1 Pins Used for the On-chip Debug Function

Pin name

(during on-chip debugging)

Input/out-

put

Function

Pin name

(in MCU mode)

OCDCK

Input

Communication control pin (clock control)

(Note 1)

P20 / TXD0 / SO0

OCDIO

I/O

Communication control pin (data control)

P21 / RXD0 / SI0

RESET

Input

Reset control pin

RESET

MODE

Input

Mode control pin

MODE

VDD

Power

supply

4.5 V to 5.5 V (note 1)

VSS

Power

supply

0 V

Input and output ports other than

P20 and P21

I/O

Can be used for an application in a target system

XIN

Input

To be connected to an oscillator to put these pins in a state of self-oscillation

XOUT

Output

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