UPD17217 datasheet(47/84 Pages) NEC

47 / 84 page

µPD17215, 17216, 17217, 17218

Table 8-2

Operations After HALT Mode Release (2/2)

(b)

HALT 02H

HALT Mode Released by:

Interrupt Status

Interrupt Enable Flag

Operations after HALT Mode Release

Disabled

Enabled

8-Bit Timer

Disabled

Enabled

Branches to interrupt vector address

8.2

HALT Instruction Execution Conditions

The HALT instruction can be executed, only under special conditions, as shown in Table 8-3, to prevent the program

from hangup.

If the conditions in Table 8-3 are not satisfied, the HALT instruction is treated as an NOP instruction.

Table 8-3

HALT Instruction Execution Conditions

Operand Value

Execution Conditions

0010B (02H)

When all interrupt request flags (IRQTM) of 8-bit timer are reset

<1> When interrupt request flag is reset, corresponding to interrupt whose interrupt enable

1000B (08H)

flag (IPTM, IPBTM, or IP) is set

<2> When high level is input to all P0A0-P0A3 and P0B0-P0B3 pins

Other Than Above

Inhibited

8.3

STOP Mode

In the STOP mode, the system clock (fx) oscillation is stopped and the program execution is stopped to minimize current

dissipation.

To set the STOP mode, use the STOP instruction.

The STOP mode releasing condition can be specified by the STOP instruction operand, as shown in Table 8-4.

After the STOP mode has released, the operation is performed as follows:

<1> Resets IRQTM.

<2> Starts the basic interval timer and watchdog timer (does not reset).

<3> Resets and starts the 8-bit timer.

<4> Executes the instruction next to [STOP 8H] when the current value of the 8-bit counter coincides with the

value of the modulo register (IRQTM is set).

Instructions are executed from the

instruction next to the HALT

instruction.

UPD17217 Datasheet(PDF) 47 Page - NEC

UPD17217 Datasheet(HTML) 47 Page - NEC

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

Datasheet Download

Link URL