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HMS91C7134K

8-BIT SINGLE-CHIP MONITOR MICROCONTROLLERS

Hynix Semiconductor 

HMS9xC7132 / HMS9xC7134

which the use of the stack starts) by using the initialization rou-

tine. Normally, the initial value of “07H” is used and the stack

area is 00H to 7FH .

Stack Area (30H ~ 7FH)

Bit 15

87

00H

SP

Bit 0

Hardware fixed

00H~7FH

SP (Stack Pointer) could be in 00H~7FH.

Program Counter: The Program Counter is a 16-bit wide which

consists of two 8-bit registers, PCH and PCL. This counter indi-

cates the address of the next instruction to be executed. In reset

state, the program counter has reset routine address (PCH:0FFH,

PCL:0FEH).

Program Status Word: The Program Status Word (PSW) con-

tains several bits that reflect the current state of the CPU and se-

lect Internal RAM(00H~1FH:Bank0~Bank3). The PSW is

described in Figure 8-4. It contains the Carry flag, the Auxiliary

carry flag, the Half Carry (for BCD operation), the General pur-

pose flag, the Register bank select flags, the Overflow flag, the

undefined flag and Parity flag.

[Carry flag CY]

This flag stores any carry or not borrow from the ALU of CPU

after an arithmetic operation and is also changed by the Shift In-

struction or Rotate Instruction.

[Auxiliary carry flag AC]

After operation, this is set when there is a carry from bit 3 of ALU

or there is no borrow from bit 4 of ALU.

[Register bank select flags RS0, RS1]

This flags select one of four bank(00~07H:bank0, 08~0fH:bank1,

10~17H:bank2, 17~1FH:bank3)in Internal RAM.

[Overflow flag OV]

This flag is set to “1” when an overflow occurs as the result of an

arithmetic operation involving signs. An overflow occurs when

the result of an addition or subtraction exceeds +127(7FH) or -

128(80H). The CLRV instruction clears the overflow flag. There

is no set instruction. When the BIT instruction is executed, bit 6

of memory is copied to this flag.

[Parity flag P]

This flag reflect on number of Accumulator’s 1. If number of Ac-

uumulator’s 1 is odd, P=0. otherwise P=1. Sum of adding Acu-

umulator’s 1 to P is always even.

R0~R7: General purpose register.

Data Pointer Register:Data Pointer Register is 16-bit wide

which consists of two-8bit registers, DPH and DPL. This register

is used as a data pointer for the data transmission with external

data memory.

MSB

PSW CY AC F0 RS1 RS0 0V

CARRY FLAG

AUXILIARY CARRY FLAG

GENERAL PURPOSE FLAG

REGISTER BANK SELECT FLAG

(to select Bank0~3 with RS0)

LSB

P RESET VALUE: 00H

PARITY FLAG

NOT ASSIGNED BIT

OVERFLOW FLAG

REGISTER BANK SELECT FLAG

(to select Bank0~3 with RS1)

Figure 8-4 PSW(Program Status Word)Register

8.2 Program Memory

The program memory consists of ROM : 32K bytes (HMS91C7132) and 32K bytes (HMS97C7132)

8.3 Data memory

The internal data memory is divided into four physically separat-

ed part : 256 bytes of RAM, 256 bytes of XRAM0, and 128 bytes

of Special Function Registers (SFRs) areas.

RAM

Four register banks, each 8 registers wide, occupy locations 0

through 31 in the lower RAM area. Only one of these banks may

be enabled at a time. The next 16 bytes, locations 32 through 47,

May.2001 ver1.1

17

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