參數(shù)資料
型號: 9S12XDP512DGV2
英文描述: Device User Guide for Mask Set L15Y - (Second Silicon - Enhanced Feature Set)
中文描述: 設備用戶指南掩模組L15Y - (二硅-增強的功能集)
文件頁數(shù): 89/152頁
文件大小: 1231K
代理商: 9S12XDP512DGV2
89
Section 4 Modes of Operation
4.1 Overview
The MCU can operate in six different modes. The different modes, the state of ROMCTL and EROMCTL
pin on rising edge of RESET and the security state of the on chip Flash memory affects the following
device characteristics:
External bus interface configuration
Access to Flash area and to unimplemented area
Register visibility in Emulation and Expanded Mode
Debug features enabled or disabled
The
XCLKS
pindefinesthe configurationof the onchip oscillatorandthe
VREGEN
pindefineswhether
the on chip voltage regulator is enabled or disabled.
4.2 Chip Configuration Summary
4.2.1 Mode Selection
TheoperatingmodeoutofresetisdeterminedbythestatesoftheMODC,MODB,andMODApinsduring
reset(
Table 4-1
).TheMODC,MODB,andMODAbitsintheMODEregistershowthecurrentoperating
modeandprovidelimitedmodeswitchingduringoperation.ThestatesoftheMODC,MODB,andMODA
pins are latched into these bits on the rising edge of the reset signal.
Table 4-1 Mode selection
PE6 =
MODB
MODA
0
0
1
1
1
0
0
1
0
0
0
1
1
X
4.2.2 ROMON and EROMON Pin Control Function
In Normal Expanded Modes and in Emulation Modes the ROMON bit and the EROMON bit in the MISC
register defines if the on chip Flash memory is the memory map or not. For a detailed description of the
ROMON and EROMON bits refer to the S12XMMC Block Guide.
The ROMCTL signal (PK7) allows the setting of the ROMON bit and EROMCTL signal (PE3) allows
the setting of the EROMON bit in the MISC register.
BKGD =
MODC
0
0
0
0
1
1
1
PE5 =
Mode Description
Special Single Chip Mode
Emulation Expanded Mode
Special Test Mode
Emulation Single Chip Mode
Normal Single Chip Mode
Normal Expanded Mode
Reserved
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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