MSC1202Y2RHHT datasheet(37/92 Pages) TI1

37 / 92 page

MSC1200

MSC1201

MSC1202

SBAS317E − APRIL 2004 − REVISED MAY 2006

www.ti.com

Serial Flash Programming Mode

Serial Flash Programming mode (SFPM) is used to

download Program and Data Memory into the onboard

Flash Memory on the MSC120x. It is initiated by holding

the P1.0/PROG pin low during the reset cycle, as shown

in Figure 23. After the reset cycle, the host can

communicate with the MSC120x through USART0. Refer

to application note SBAA076 (www.ti.com) for serial

programming commands and protocol.

In SFPM, the MSC120x uses the internal oscillator in low

frequency mode (that is, the external clock is disabled).

The internal oscillator frequency is affected by the power

supply voltage and device temperature. Therefore, in

order to avoid losing communication during programming,

it is important to have a stable power supply and

temperature environment during serial communication.

The recommended baud rate range for SFPM is 2400 to

19200. If communication errors occur, decreasing the

baud rate may improve communication performance.

Also note that in SFPM, the Brownout Detect circuit is

disabled and AVDD must be > 2.0V.

INTERRUPTS

The MSC120x use a three-priority interrupt system. As

shown in Table 6, each interrupt source has an

independent priority bit, flag, interrupt vector, and enable

(except that nine interrupts share the Auxiliary Interrupt,

AI, at the highest priority). In addition, interrupts can be

globally enabled or disabled. The interrupt structure is

compatible with the original 8051 family. All of the standard

interrupts are available.

MSC120x

P1.0/PROG

P3.0 RXD

P3.1 TXD

Serial

Port 0

RST

Reset Circuit (or V

DD)

RS232

Transceiver

Host PC

Serial Terminal

NOTE: Serial programming is selected when P1.0/PROG is low at reset.

Figure 23. Serial Flash Programming Mode

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