HD4046212RFS datasheet(37/157 Pages) RENESAS

37 / 157 page

HD404629R Series

Stop Mode: In stop mode, all MCU operations stop and RAM data is retained. Therefore, the power

dissipation in this mode is the least of all modes. The OSC

1 and OSC2 oscillator stops. For the X1 and X2

oscillator to operate or stop can be selected by setting bit 3 of the system clock select register (SSR: $029;

operating: SSR3 = 0, stop: SSR3 = 1) (figure 27). The MCU enters stop mode if the STOP instruction is

executed in active mode when bit 3 of timer mode register A (TMA: $008) is set to 0 (TMA3 = 0) (figure

44).

Stop mode is terminated by a RESET input or a

STOPC input as shown in figure 16. RESET or STOPC

must be applied for at least one t

RC to stabilize oscillation (refer to the AC Characteristics section).

When

the MCU restarts after stop mode is cancelled, all RAM contents before entering stop mode are retained,

but the accuracy of the contents of the accumulator, B register, W register, X/SPX register, Y/SPY register,

carry flag, and serial data register cannot be guaranteed.

Stop mode

Oscillator

Internal

clock

STOP instruction execution

(at least equal to oscillator stabilization time tRC)

tres

RESET

STOPC

Figure 16 Timing of Stop Mode Cancellation

Watch Mode: In watch mode, the clock function (timer A) using the X1 and X2 oscillator and the LCD

function operate, but other function operations stop. Therefore, the power dissipation in this mode is the

second least to stop mode, and this mode is convenient when only clock display is used. In this mode, the

OSC

1 and OSC2 oscillator stops, but the X1 and X2 oscillator operates. The MCU enters watch mode if the

STOP instruction is executed in active mode when TMA3 = 1, or if the STOP or SBY instruction is

executed in subactive mode.

Watch mode is terminated by a RESET input or a timer-A/

INT

0 interrupt request.

For details of RESET

input, refer to the Stop Mode section. When terminated by a timer-A/

INT

0 interrupt request, the MCU

enters active mode if LSON = 0, or subactive mode if LSON = 1. After an interrupt request is generated,

the time required to enter active mode is t

RC for a timer A interrupt, and TX (where T + tRC < TX < 2T + tRC)

for an

INT

0 interrupt, as shown in figures 17 and 18.

Operation during mode transition is the same as that at standby mode cancellation (figure 15).

HD4046212RFS Datasheet(PDF) 37 Page - Renesas Technology Corp

HD4046212RFS Datasheet(HTML) 37 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