參數(shù)資料
型號(hào)： MC9S12C32MFU
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： 16-BIT, FLASH, 25 MHz, MICROCONTROLLER, PQFP80
封裝： QFP-80
文件頁(yè)數(shù)： 28/94頁(yè)
文件大小： 906K
代理商： MC9S12C32MFU
Device User Guide — 9S12C32DGV1/D V01.01
34
There are two basic types of operating modes:
1.
Normal modes: Some registers and bits are protected against accidental changes.
2.
Special modes: Allow greater access to protected control registers and bits for special purposes such
as testing.
A system development and debug feature, background debug mode (BDM), is available in all modes. In
special single-chip mode, BDM is active immediately after reset.
Some aspects of Port E are not mode dependent. Bit 1 of Port E is a general purpose input or the IRQ
interrupt input. IRQ can be enabled by bits in the CPU’s condition codes register but it is inhibited at reset
so this pin is initially configured as a simple input with a pull-up. Bit 0 of Port E is a general purpose input
or the XIRQ interrupt input. XIRQ can be enabled by bits in the CPU’s condition codes register but it is
inhibited at reset so this pin is initially configured as a simple input with a pull-up. The ESTR bit in the
EBICTL register is set to one by reset in any user mode. This assures that the reset vector can be fetched
even if it is located in an external slow memory device. The PE6/MODB/IPIPE1 and PE5/MODA/IPIPE0
pins act as high-impedance mode select inputs during reset.
The following paragraphs discuss the default bus setup and describe which aspects of the bus can be
changed after reset on a per mode basis.
4.2.1 Normal Operating Modes
These modes provide three operating configurations. Background debug is available in all three modes,
but must first be enabled for some operations by means of a BDM background command, then activated.
Table 4-1 Mode Selection
MODC
MODB
MODA
Mode Description
Notes
000
Special Single Chip, BDM allowed and ACTIVE. BDM is allowed in all
other modes but a serial command is required to make BDM active.
Available in all
package versions
0
1
Emulation Expanded Narrow, BDM allowed
Only available in
80 QFP
0
1
0
Special Test (Expanded Wide), BDM allowed
Only available in
80 QFP
0
1
Emulation Expanded Wide, BDM allowed
Only available in
80 QFP
1
0
Normal Single Chip, BDM allowed
Available in all
package versions
1
0
1
Normal Expanded Narrow, BDM allowed
Only available in
80 QFP
110
Special Peripheral; BDM allowed but bus operations would cause bus
conicts (must not be used)
Only available in
80 QFP
1
Normal Expanded Wide, BDM allowed
Only available in
80 QFP
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