UPSD3422 datasheet(253/293 Pages) STMICROELECTRONICS

253 / 293 page

uPSD34xx

PSD module

253/293

Figure 91.

JTAG chain in uPSD34xx package

28.6.3

In-system programming

The ISP function can use two different configurations of the JTAG interface:

●

4-pin JTAG: TDI, TDO, TCK, TMS

●

6-pin JTAG: Signals above plus TSTAT, TERR

At power-up, the four basic JTAG signals are all inputs, waiting for a command to appear on

the JTAG bus from programming or test equipment. When the enabling command is

received, TDO becomes an output and the JTAG channel is fully functional. The same

command that enables the JTAG channel may optionally enable the two additional signals,

TSTAT and TERR.

28.6.4

4-pin JTAG ISP (default)

The four basic JTAG pins on Port C are enabled for JTAG operation at all times. These pins

may not be used for other I/O functions. There is no action needed in PSDsoft Express to

configure a device to use 4-pin JTAG, as this is the default condition. No 8032 firmware is

needed to use 4-pin ISP because all ISP functions are controlled from the external JTAG

program/test equipment. Figure 92 shows recommended connections on a circuit board to a

JTAG program/test tool using 4-pin JTAG. It is required to connect the RST output signal

from the JTAG program/test equipment to the RESET_IN input on the uPSD34xx. The RST

signal is driven by the equipment with an Open Drain driver, allowing other sources (like a

push button) to drive RESET_IN without conflict.

Note:

The recommended pull-up resistors and decoupling capacitor are illustrated in Figure 92.

JTAG TDI

JTAG TMS

JTAG TCK

JTAG TDO

TDI

TMS TCK

TDO

TMS TCK

TDI

PC3 / TSTAT

PC4 / TERR

TSTAT

TERR

OPTIONAL

JTAG TAP

CONTROLLER

JTAG TAP

CONTROLLER

RESET_IN

OPTIONAL

DEBUG

RESET

RST

8032 MCU

MCU MODULE

PSD MODULE

MAIN

FLASH

MEMORY

2ND

FLASH

MEMORY

PLD

uPSD34xx

IEEE 1149.1

AI10460

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