Datasheet 搜索 > 微处理器 > NXP（恩智浦） > MPC8309CVMAGDCA 数据手册 > MPC8309CVMAGDCA 用户编程技术手册 5/24 页
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MPC8309CVMAGDCA 用户编程技术手册 - NXP（恩智浦）
制造商:
NXP（恩智浦）
分类:
微处理器
封装:
BGA-489
描述:
NXP MPC8309CVMAGDCA 芯片, 微处理器, 32位, 400MHZ, MAPBGA-489
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MPC8309CVMAGDCA数据手册
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PROFIBUS on the QUICC Engine Block, Rev. 1
Freescale Semiconductor 5
Baud rate generation and timers
1.4 Configuration for recommended operating frequencies
The following table details the recommended QUICC Engine, BRG and CETSCR frequencies for each
device family.
The table below indicates which scaling factor to use with each baud rate.
Table 3. Operating frequencies and associated configuration
P10xx MPC830x LS1020/21
QUICC Engine
frequency
384MHz 192MHz 288MHz
BRG frequency
192MHz
1
1
The BRG frequency is the QUICC Engine clock divided by 2.
96MHz
1
288MHz
2
2
The BRG frequency must be programmed to be sourced from the
platform clock by setting BRGCn[EXTC] = 0b01
CETSCR1[ECR]
3
3
Must be programmed to generate a timestamp counter incrementing at a
frequency of 12MHz
30 14 22
brg_freq_enum
4
4
This is a microcode parameter resident in the UCC PROFIBUS
parameter RAM
213
Table 4. Scaling factors
Baud rate scaling_factor
1
1
This is a microcode parameter resident in the UCC PROFIBUS
parameter RAM, it is calculated as follows:
(BRGCn[CD] + 1) /
(BRG_Frequency / 96M).
12M 1
6M 2
3M 4
1.5M 8
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