PMS232 datasheet(29/94 Pages) PADAUK

29 / 94 page

PMC232/PMS232 Series

12-bit ADC Enhanced FPPA

8-bit OTP Controller

Page 29 of 94

PDK-DS-PMx232_V104– Dec. 18, 2018

5-1-1. Program Counter

Program Counter (PC) is the unit that contains the address of an instruction to be executed next. The

program counter is automatically incremented at each instruction cycle so that instructions are retrieved

sequentially from the program memory. Certain instructions, such as branches and subroutine calls, interrupt

the sequence by placing a new value in the program counter. The bit length of the program counter is 12 for

PMC232/PMS232. The program counter of FPP0 is 0 after hardware reset and 1 for FPP1. Whenever an

interrupt happens in FPP0, the program counter will jump to ’h10 for interrupt service routine. Each FPP unit

has its own program counter to control the program execution sequence.

5-1-2. Stack Pointer

The stack pointer in each processing unit is used to point the top of the stack area where the local variables

and parameters to subroutines are stored; the stack pointer register (sp) is located in IO address 0x02h. The

bit number of stack pointer is 8 bit; the stack memory cannot be accessed over 160 bytes and should be

defined within 160 bytes from 0x00h address. The stack memory of PMC232/PMS232 for each FPP unit can

be assigned by user via stack pointer register, means that the depth of stack pointer for each FPP unit is

adjustable in order to optimize system performance. The following example shows how to define the stack in

the ASM (assembly language) project:

﹒ROMADR

GOTO

FPPA0

GOTO

FPPA1

...

﹒RAMADR

// Address must be less than 0x100

WORD

Stack0 [1]

// one WORD

WORD

Stack1 [2]

// two WORD

...

FPPA0:

Stack0;

// assign Stack0 for FPPA0,

// one level call because of Stack0[1]

...

call

function1

...

FPPA1:

Stack1;

// assign Stack1 for FPPA1,

// two level call because of Stack1[2]

...

call

function2

...

In Mini-C project, the stack calculation is done by system software, user will not have effort on it, and the

example is shown as below:

void

FPPA0 (void)

{

...

}

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