参数资料
型号: MC68CK338CPV14B1
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, 14.4 MHz, MICROCONTROLLER, PQFP144
封装: PLASTIC, TQFP-144
文件页数: 119/133页
文件大小: 944K
代理商: MC68CK338CPV14B1
MOTOROLA
MC68CK338
86
MC68CK338TS/D
Figure 19 CPSM Block Diagram
6.5.1 CPSM Registers
The CPSM contains a control register and a test register. All unused bits and reserved address loca-
tions return zero when read by the software. Writing to unused bits and reserved address locations has
no effect.
PRUN — Prescaler Running
The PRUN bit is a read/write control bit that allows the software to switch the prescaler counter on and
off. This bit allows the counters in various CTM6 submodules to be synchronized. It is cleared by reset.
0 = Prescaler is held in reset and is not running
1 = Prescaler is running
DIV23 — Divide By 2/Divide By 3
The DIV23 bit is a read/write control bit that selects the division ratio of the first prescaler counter. It may
be changed by the software at any time and is cleared by reset.
0 = First prescaler stage divides by two
1 = First prescaler stage divides by three
PSEL[1:0] — Prescaler Division Ratio Select Field
This bit field selects the division ratio of the programmable prescaler output signal (PCLK6). Refer to
CPCR — CPSM Control Register
$YFF408
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
NOT USED
PRUN
DIV23
PSEL[1:0]
RESET:
0
CTM CPSM BLOCK
fsys
8-BIT
PCLK2 =
PCLK3 =
PCLK4 =
PCLK5 =
PCLK6 =
FIRST CPSM
SELECT
PCLK1 =
÷2
÷4
÷8
÷16
÷32
PRESCALER
÷64
÷128
÷256
PRUN
DIV23 PSEL1 PSEL0
CPCR
PRESCALER
÷2 or ÷3
fsys ÷ 2
fsys ÷ 4
fsys ÷ 8
fsys ÷ 16
fsys ÷ 32
fsys ÷ 64
fsys ÷ 128
fsys ÷ 256
fsys ÷ 512
fsys ÷ 3
fsys ÷ 6
fsys ÷ 12
fsys ÷ 24
fsys ÷ 48
fsys ÷ 96
fsys ÷ 192
fsys ÷ 384
fsys ÷ 768
DIV23 =
÷ 3
DIV23 =
÷ 2
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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