STM8S datasheet(25/467 Pages) STMICROELECTRONICS

Il numero della parte	STM8S

Spiegazioni elettronici	STM8S Series and STM8AF Series 8-bit microcontrollers

PDF	467 Pages

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Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

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RM0016

Central processing unit (CPU)

Figure 2. Stacking order

Condition code register (CC)

The condition code register is an 8-bit register which indicates the result of the instruction

just executed as well as the state of the processor. The 6th bit (MSB) of this register is

reserved. These bits can be individually tested by a program and specified action taken as a

result of their state. The following paragraphs describe each bit:

•

V: Overflow

When set, V indicates that an overflow occurred during the last signed arithmetic operation,

on the MSB result bit. See the INC, INCW, DEC, DECW, NEG, NEGW, ADD, ADDW, ADC,

SUB, SUBW, SBC, CP, and CPW instructions.

•

I1: Interrupt mask level 1

The I1 flag works in conjunction with the I0 flag to define the current interruptability level as

shown in Table 1. These flags can be set and cleared by software through the RIM, SIM,

HALT, WFI, IRET, TRAP, and POP instructions and are automatically set by hardware when

entering an interrupt service routine.

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