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PC912XDP512F0MPVR 데이터시트(PDF) 664 Page - Freescale Semiconductor, Inc

부품명 PC912XDP512F0MPVR
상세설명  HCS12X Microcontrollers
PDF  1348 Pages
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제조업체  FREESCALE [Freescale Semiconductor, Inc]
홈페이지  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

PC912XDP512F0MPVR 데이터시트(HTML) 664 Page - Freescale Semiconductor, Inc

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Chapter 18 Memory Mapping Control (S12XMMCV3)
MC9S12XDP512 Data Sheet, Rev. 2.21
664
Freescale Semiconductor
18.3.2.6
RAM Page Index Register (RPAGE)
Read: Anytime
Write: Anytime
These eight index bits are used to page 4 KByte blocks into the RAM page window located in the local
(CPU or BDM) memory map from address 0x1000 to address 0x1FFF (see Figure 18-12). This supports
accessing up to 1022 Kbytes of RAM (in the Global map) within the 64 KByte Local map. The RAM page
index register is effectively used to construct paged RAM addresses in the Local map format.
CAUTION
XGATE write access to this register during an CPU access which makes use
of this register could lead to unexpected results.
Table 18-11. Data Sources when CPU or BDM is Accessing Flash Area
Chip Modes
ROMON
EROMON
DATA SOURCE1
1 Internal Flash means Flash resources inside the MCU are read/written.
Emulation memory means resources inside the emulator are read/written (PRU registers, flash
replacement, RAM, EEPROM and register space are always considered internal).
External application means resources residing outside the MCU are read/written.
Stretch2
2 The external access stretch mechanism is part of the EBI module (refer to EBI Block Guide for details).
Normal Single Chip
X
X
Internal Flash
N
Special Single Chip
Emulation Single Chip
X
0
Emulation Memory
N
X
1
Internal Flash
Normal Expanded
0
X
External Application
Y
1
X
Internal Flash
N
Emulation Expanded
0
X
External Application
Y
1
0
Emulation Memory
N
1
1
Internal Flash
Special Test
0
X
External Application
N
1
X
Internal Flash
Address: 0x0016
76543210
R
RP7
RP6
RP5
RP4
RP3
RP2
RP1
RP0
W
Reset
11111101
Figure 18-11. RAM Page Index Register (RPAGE)



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