HD404448 datasheet(19/125 Pages) RENESAS

19 / 125 page

HD404449 Series

Item

Abbr.

Status After

Cancellation of Stop

Mode by

STOPC Input

Status After

Cancellation of Stop

Mode by MCU Reset

Status After all Other

Types of Reset

Carry flag

(CA)

Pre-stop-mode values are not guaranteed;

values must be initialized by program

Pre-stop-mode values

are not guaranteed;

values must be

initialized by program

Accumulator

(A)

B register

(B)

W register

(W)

X/SPX register

(X/SPX)

Y/SPY register

(Y/SPY)

Serial data register (SRL, SRU)

A/D data register

(ADRL,

ADRU)

RAM

Pre-stop-mode values are retained

RAM enable flag

(RAME)

Port mode register

1 bit 2

(PMRC12)

Pre-stop-mode values

are retained

System clock

select register bit 3

(SSR3)

Interrupts

The MCU has 11 interrupt sources: four external signals (

INT

0, INT1, INT2, INT 3), four timer/counters

(timers A, B, C, and D), two serial interfaces (serial 1, serial 2), and A/D converter.

An interrupt request flag (IF), interrupt mask (IM), and vector address are provided for each interrupt

source, and an interrupt enable flag (IE) controls the entire interrupt process.

Some vector addresses are shared by two different interrupts. They are timer B and INT

2, timer C and

INT

3, timer D and A/D converter, and serial interface 1 and serial interface 2.

So the type of request that

has occurred must be checked at the beginning of interrupt processing.

Interrupt Control Bits and Interrupt Processing: Locations $000 to $003 and $022 to $023 in RAM are

reserved for the interrupt control bits which can be accessed by RAM bit manipulation instructions.

The interrupt request flag (IF) cannot be set by software. MCU reset initializes the interrupt enable flag

(IE) and the IF to 0 and the interrupt mask (IM) to 1.

A block diagram of the interrupt control circuit is shown in figure 9, interrupt priorities and vector

addresses are listed in table 2, and interrupt processing conditions for the 11 interrupt sources are listed in

table 3.

HD404448 Datasheet(PDF) 19 Page - Renesas Technology Corp

HD404448 Datasheet(HTML) 19 Page - Renesas Technology Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL