參數(shù)資料
型號： GMS87C7216Q
廠商： Electronic Theatre Controls, Inc.
元件分類： 8位微控制器
英文描述： 8-BIT SINGLE-CHIP MICROCONTROLLERS
中文描述： 8位單晶片微控制器
文件頁數(shù)： 40/121頁
文件大小： 1645K
代理商： GMS87C7216Q
GMS81C7208/7216
36
FEB. 2005 Ver 1.04
10. CLOCK GENERATOR
As shown in Figure 10-1, the clock generator produces the basic
clock pulses which provide the system clock to be supplied to the
CPU and the peripheral hardware. It contains an oscillators: a
main-frequency clock oscillator. The system clock can also be
obtained from the external oscillator.
The clock generator produces the system clocks forming clock
pulse, which are supplied to the CPU and the peripheral hard-
ware. The internal system clock can be selected by bit2, and bit3
of the system clock mode register(SCMR).
The register is shown in Figure 10-2.
To the peripheral block, the clock among the not-divided original
clocks, divided by 2
, 4,...,
up to 1024 can be provided. Peripheral
clock is enabled or disabled by STOP instruction.
Figure 10-1 Block Diagram of Clock Generator
CPU Clock
Instruction Cycle Time
X
IN
= 4MHz
÷
2
0.5 us
÷
8
2.0 us
÷
16
4.0 us
÷
64
16.0 us
Internal system clock (CPU clock)
PRESCALER
0
X
IN
PIN
÷
1
Peripheral clock
MUX
÷
2
÷
4
÷
8
÷
16
÷
128
÷
256
÷
512
÷
1024
÷
32
÷
64
÷
2
÷
8
÷
16
÷
64
Select clock
SCS[1:0]
OSC Stop
SYCC<1>=0 & LCR<7>=1
SYCC<0>
STOP Mode
SLEEP Mode
PS0
PS1
PS2
PS3
PS4
PS5
PS6
PS7
PS8
PS9
PS10
C
f
EX
(MHz)
Frequency
PS0
PS3
PS2
PS4
PS1
PS10
PS9
PS5
PS6
PS7
4
period
4M
1M
500K
250K
2M
125K
62.5K
250n
500n
1u
2u
4u
8u
16u
32u
64u
256u
128u
3.906K
7.183K
15.63K
31.25K
PS8
f
EX
G
1
Reserved
SYCC<1>=1 & LCR<7>=0
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