參數(shù)資料
型號: M37542F8SP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDIP32
封裝: 8.9 X 28 MM, 1.78 MM PITCH, PLASTIC, SDIP-32
文件頁數(shù): 87/124頁
文件大小: 1238K
代理商: M37542F8SP
7542 Group
Rev.3.03
Jul 11, 2008
Page 63 of 117
REJ03B0006-0303
● On-chip oscillation division ratio
At on-chip oscillator mode, division ratio of on-chip oscillator for
CPU clock is selected by setting value of on-chip oscillation divi-
sion ratio selection register. The division ratio of on-chip oscillation
for CPU clock is selected from among 1/1, 1/2, 1/8, 1/128. The op-
eration clock for the peripheral function block is not changed by
setting value of this register.
■ Notes on On-chip Oscillation Division Ratio
When system is released from reset, ROSC/8 (on-chip oscillator
middle-speed mode) is selected for CPU clock.
When state transition from the ceramic or RC oscillation to on-
chip oscillator, ROSC/8 (on-chip oscillator middle-speed mode)
is selected for CPU clock.
When the MCU operates by on-chip oscillator for the main clock
without external oscillation circuit, connect XIN pin to VCC
through a resistor and leave XOUT pin open.
Set “10010x002” (x = 0 or 1) to CPUM.
Fig. 81 Structure of on-chip oscillation division ratio selection register
On-chip oscillation division ratio selection register
(RODR: address 003716, initial value: 0216)
On-chip oscillator division ratio
b1 b0
00: On-chip oscillator double-speed mode (ROSC/1)
01: On-chip oscillator high-speed mode (ROSC/2)
10: On-chip oscillator middle-speed mode (ROSC/8)
11: On-chip oscillator low-speed mode (ROSC/128)
Not used (returns “0” when read)
b7
b0
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