PSD913F2 datasheet(12/94 Pages) STMICROELECTRONICS

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PSD9XX Family

Preliminary Information

5.7 In-System Programming

Using the JTAG signals on Port C, the entire PSD9XX device can be programmed or

erased without the use of the microcontroller (ISP). The main Flash memory can also be

programmed in-system by the microcontroller executing the programming algorithms out of

the Secondary Flash memory, or SRAM (IAP). The Secondary Flash memory can be

programmed the same way by executing out of the main Flash memory. The PLD logic

or other PSD9XX configuration can be programmed through the JTAG port or a device

programmer. Table 4 indicates which programming methods can program different

functional blocks of the PSD9XX.

PSD9XX

Architectural

Overview

(cont.)

Device

Functional Block

JTAG-ISP

Programmer

IAP

Main Flash Memory

Yes

Secondary Flash Memory

Yes

PLD Array (DPLD and GPLD)

Yes

PSD Configuration

Yes

Table 4. Methods of Programming Different Functional Blocks of the PSD9XX

5.8 Power Management Unit

The Power Management Unit (PMU) in the PSD9XX gives the user control of the power

consumption on selected functional blocks based on system requirements. The PMU

includes an Automatic Power Down unit (APD) that will turn off device functions due to

microcontroller inactivity. The APD unit has a Power Down Mode that helps reduce power

consumption.

The PSD9XX also has some bits that are configured at run-time by the MCU to reduce

power consumption of the PLD. The turbo bit in the PMMR0 register can be turned off and

the PLD will latch its outputs and go to sleep until the next transition on its inputs.

Additionally, bits in the PMMR2 register can be set by the MCU to block signals from

entering the PLD to reduce power consumption. See section 9.5.

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