PMS232 datasheet(28/94 Pages) PADAUK

28 / 94 page

PMC232/PMS232 Series

12-bit ADC Enhanced FPPA

8-bit OTP Controller

Page 28 of 94

PDK-DS-PMx232_V104– Dec. 18, 2018

5. Functional Description

5-1. Processing Units

There are two processing units (FPP unit) inside the chip of PMC232/PMS232. In each processing unit, it

includes (i) its own Program Counter to control the program execution sequence (ii) its own Stack Pointer to

store or restore the program counter for program execution (iii) its own accumulator (iv) Status Flag to record

the status of program execution. Each FPP unit has its own program counter and accumulator for program

execution, flag register to record the status, and stack pointer for jump operation. Based on such architecture,

FPP unit can execute its own program independently, thus parallel processing can be expected.

These two FPP units share the same 2k×16 bits OTP program memory, 160 bytes data SRAM and all the IO

ports, these two FPP units are operated at mutual exclusive clock cycles to avoid interference. One task switch

is built inside the chip to decide which FPP unit should be active for the corresponding cycle. The hardware

diagram and basic timing diagram of FPP units are illustrated in Fig. 1. For FPP0 unit, its program will be

executed in sequence every other system clock, shown as (M-1)th, Mth and (M+1)th instructions. For FPP1 unit,

its program will be also executed in sequence every other system clock, shown as (N-1)th, Nth and (N+1)th

instructions.

Fig.1: Hardware and Timing Diagram of FPP unit

Each FPP unit has half computing power of whole system; for example, FPP0 and FPP1will be operated at

4MHz if system clock is 8MHz. The FPP unit can be enabled or disabled by programming the FPP unit Enable

FPP1 unit can be enabled by user’s program if necessary. Both FPP0 and FPP1 can be enabled or disabled by

using any one FPP unit.

Program Counter 0

Stack Pointer 0

Accumulator 0

Flag register 0

FPP0

Program Counter 1

Stack Pointer 1

Accumulator 1

Flag register 1

FPP1

2KW OTP

Program

Memory

160 bytes

SRAM

IO Port

Task Switch

System Clock

Time

FPP0 active

FPP1 active

Mth

(M+1)th

(M-1)th

Nth

(N+1)th

(N-1)th

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