参数资料
型号: m789436
厂商: NEC Corp.
元件分类: 8位微控制器
英文描述: 8-Bit Single-Chip Microcontrollers
中文描述: 8位单芯片微控制器
文件页数: 17/144页
文件大小: 1378K
代理商: M789436
CHAPTER 5 CLOCK GENERATOR
User’s Manual U15075EJ1V0UM00
113
5.6 Changing Setting of System Clock and CPU Clock
5.6.1 Time required for switching between system clock and CPU clock
The CPU clock can be selected by using bit 1 (PCC1) of the processor clock control register (PCC) and bit 4
(CSS0) of the subclock control register (CSS).
Actually, the specified clock is not selected immediately after the setting of PCC has been changed, and the old
clock is used for the duration of several instructions after that (see Table 5-2).
Table 5-2. Maximum Time Required for Switching CPU Clock
Set Value Before Switching
Set Value After Switching
CSS0
PCC1
CSS0
PCC1
CSS0
PCC1
CSS0
PCC1
00
01
1x
0
4 clocks
2fX/fXT clocks
(306 clocks)
1
2 clocks
fX/2fXT clocks
(76 clocks)
1
x
2 clocks
Remarks 1. Two clocks are the minimum instruction execution time of the CPU clock before switching.
2. The parenthesized values apply to operation at fX = 5.0 MHz or fXT = 32.768 kHz.
3. x: don’t care
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