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參數(shù)資料
| 型號(hào)： | M16C |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | SR BTS PC 13 ASY C |
| 中文描述： | 單片16位CMOS微機(jī) |
| 文件頁(yè)數(shù)： | 64/349頁(yè) |
| 文件大小： | 5388K |
| 代理商： | M16C |
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Clock Generation Circuit
63
Mitsubishi microcomputers
M16C / 62P Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
development
Preliminary Specifications Rev.1.0
Specifications in this manual are tentative and subject to change.
Power Control
There are three power control modes. For convenience’ sake, all modes other than wait and stop modes
are referred to as normal operation mode here.
(1) Normal Operation Mode
Normal operation mode is further classified into seven modes.
In normal operation mode, because the CPU clock and the peripheral function clocks both are on, the
CPU and the peripheral functions are operating. Power control is exercised by controlling the CPU clock
frequency. The higher the CPU clock frequency, the greater the processing capability. The lower the CPU
clock frequency, the smaller the power consumption in the chip. If the unnecessary oscillator circuits are
turned off, the power consumption is further reduced.
Before the clock sources for the CPU clock can be switched over, the new clock source to which switched
must be oscillating stably. If the new clock source is the main clock, sub clock or PLL clock, allow a
sufficient wait time in a program until it becomes oscillating stably.
Note that operation modes cannot be changed directly from low speed or low power dissipation mode to
ring oscillator or ring oscillator low power dissipation mode. Nor can operation modes be changed directly
from ring oscillator or ring oscillator low power dissipation mode to low speed or low power dissipation
mode. Where the CPU clock source is changed from the ring oscillator to the main clock, change the
operation mode to the medium speed mode (divided by 8 mode) after the clock was divided by 8 (the
CM06 bit of CM0 register was set to “1”) in the ring oscillator mode.
High-speed Mode
The main clock divided by 1 provides the CPU clock. If the sub clock is on, f
C32
can be used as the
count source for timers A and B.
PLL Operation Mode
The main clock multiplied by 2, 4, 6 or 8 provides the PLL clock, and this PLL clock serves as the CPU
clock. If the sub clock is on, f
C32
can be used as the count source for timers A and B. PLL operation
mode can be entered from high speed mode. If PLL operation mode is to be changed to wait or stop
mode, first go to high speed mode before changing.
Medium-speed Mode
The main clock divided by 2, 4, 8 or 16 provides the CPU clock. If the sub clock is on, f
C32
can be used
as the count source for timers A and B.
Low-speed Mode
The sub clock provides the CPU clock. The main clock is used as the clock source for the peripheral
function clock when the CM21 bit is set to “0” (ring oscillator turned off), and the ring oscillator clock is
used when the CM21 bit is set to “1” (ring oscillator oscillating).
The f
C32
clock can be used as the count source for timers A and B.
Low Power Dissipation Mode
In this mode, the main clock is turned off after being placed in low speed mode. The sub clock provides
the CPU clock. The f
C32
clock can be used as the count source for timers A and B. f
C32
is the only
peripheral function clock available when the CM21 bit is set to “0” (ring oscillator turned off). If the
CM21 bit is set to “1” (ring oscillator oscillating), then f
C32
and the ring oscillator clock can be used.
Simultaneously when this mode is selected, the CM06 bit of CM0 register becomes “1” (divided by 8
mode). In the low power dissipation mode, do not change the CM06 bit. Consequently, the medium
speed (divided by 8) mode is to be selected when the main clock is operated next.
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