PFS172 datasheet(27/92 Pages) PADAUK

27 / 92 page

PFS172

8bit MTP MCU with 8-bit ADC

Page 27 of 92

PDK-DS-PFS172-EN_V000-May 8, 2020

5. Functional Description

5.1. Program Memory - MTP

The MTP (Multiple Time Programmable) program memory is used to store the program instructions to be

executed. The MTP program memory may contains the data, tables and interrupt entry. After reset, the

program will start from the initial address 0x000 which is GOTO FPPA0 instruction usually. The interrupt entry

is 0x10 if used, the last 32 addresses are reserved for system using, like checksum, serial number, etc. The

MTP program memory for PFS172 is 2KW that is partitioned as Table 1. The MTP memory from address

0X7E0 to 0x7FF is for system using, address space from 0x001 to 0x00F and from 0x011 to 0X7DF are user

program spaces.

Address

Function

0x000

GOTO FPPA0 instruction

0x001

User program

•

0x00F

User program

0x010

Interrupt entry address

0x011

User program

•

0x7DF

User program

0X7E0

System Using

•

0x7FF

System Using

Table 1: Program Memory Organization

5.2. Boot Procedure

POR (Power-On-Reset) is used to reset PFS172 when power up. The boot up time can be optional fast or

normal. Customer must ensure the stability of supply voltage after power up no matter which option is chosen,

the power up sequence is shown in the Fig. 1 and tSBP is the boot up time.

Fig.1: Power-Up Sequence

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