M16CSLASH62M datasheet(61/615 Pages) RENESAS

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Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Status Transition of BCLK

1-42

1000

Invalid

Division by 2 mode

0000

Invalid

Division by 4 mode

Invalid

Division by 8 mode

1000

Invalid

Division by 16 mode

0000

Invalid

No-division mode

Invalid

Low-speed mode

Invalid

Low power dissipation mode

Status Transition of BCLK

Power dissipation can be reduced and low-voltage operation achieved by changing the count source for

BCLK. Table 1.10.4 shows the operating modes corresponding to the settings of system clock control

registers 0 and 1.

When reset, the device starts in division by 8 mode. The main clock division select bit 0(bit 6 at address

000616) changes to “1” when shifting from high-speed/medium-speed to stop mode and at a reset. When

shifting from low-speed/low power dissipation mode to stop mode, the value before stop mode is retained.

The following shows the operational modes of BCLK.

(1) Division by 2 mode

The main clock is divided by 2 to obtain the BCLK.

(2) Division by 4 mode

The main clock is divided by 4 to obtain the BCLK.

(3) Division by 8 mode

The main clock is divided by 8 to obtain the BCLK. When reset, the device starts operating from this

mode. Before the user can go from this mode to no division mode, division by 2 mode, or division by 4

mode, the main clock must be oscillating stably. When going to low-speed or lower power consumption

mode, make sure the sub-clock is oscillating stably.

(4) Division by 16 mode

The main clock is divided by 16 to obtain the BCLK.

(5) No-division mode

The main clock is divided by 1 to obtain the BCLK.

(6) Low-speed mode

fC is used as the BCLK. Note that oscillation of both the main and sub-clocks must have stabilized before

transferring from this mode to another or vice versa. At least 2 to 3 seconds are required after the sub-

clock starts. Therefore, the program must be written to wait until this clock has stabilized immediately

after powering up and after stop mode is cancelled.

(7) Low power dissipation mode

fC is the BCLK and the main clock is stopped.

Note : Before the count source for BCLK can be changed from XIN to XCIN or vice versa, the clock to which

the count source is going to be switched must be oscillating stably. Allow a wait time in software for

the oscillation to stabilize before switching over the clock.

CM17

CM16

CM07

CM06

CM05

CM04

Operating mode of BCLK

Table 1.10.4. Operating modes dictated by settings of system clock control registers 0 and 1

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