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PC912XDP512F0MPVR 데이터시트(PDF) 787 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) 787 Page - Freescale Semiconductor, Inc

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Chapter 21 External Bus Interface (S12XEBIV2)
MC9S12XDP512 Data Sheet, Rev. 2.21
Freescale Semiconductor
789
Table 21-1. External System Signals Associated with XEBI
Signal
I1/O
1 All inputs are capable of reducing input threshold level
EBI Signal
Multiplex
(T)ime2
(F)unction3
2 Time-multiplex means that the respective signals share the same pin on chip level and are active alternating in a dedicated
time slot (in modes where applicable).
3 Function-multiplex means that one of the respective signals sharing the same pin on chip level continuously uses the pin
depending on configuration and reset state.
Description
Available in Modes
NS
SS
NX
ES
EX
ST
RE
O
—
—
Read Enable, indicates external read access
No
No
Yes
No
No
No
ADDR[22:20]
O
T
—
External address
No
No
Yes
Yes
Yes
Yes
ACC[2:0]
O
—
Access source
No
No
No
Yes
Yes
Yes
ADDR[19:16]
O
T
—
External address
No
No
Yes
Yes
Yes
Yes
IQSTAT[3:0]
O
—
Instruction Queue Status
No
No
No
Yes
Yes
Yes
ADDR[15:1]
O
T
—
External address
No
No
Yes
Yes
Yes
Yes
IVD[15:1]
O
—
Internal visibility read data (IVIS = 1)
No
No
No
Yes
Yes
Yes
ADDR0
O
T
F
External address
No
No
No
Yes
Yes
Yes
IVD0
O
Internal visibility read data (IVIS = 1)
No
No
No
Yes
Yes
Yes
UDS
O
—
Upper Data Select, indicates external access
to the high byte DATA[15:8]
No
No
Yes
No
No
No
LSTRB
O
—
F
Low Strobe, indicates valid data on DATA[7:0]
No
No
No
Yes
Yes
Yes
LDS
O
—
Lower Data Select, indicates external access
to the low byte DATA[7:0]
No
No
Yes
No
No
No
R/W
O
—
F
Read/Write, indicates the direction of internal
data transfers
No
No
No
Yes
Yes
Yes
WE
O
—
Write Enable, indicates external write access
No
No
Yes
No
No
No
DATA[15:8]
I/O
—
—
Bidirectional data (even address)
No
No
Yes
Yes
Yes
Yes
DATA[7:0]
I/O
—
—
Bidirectional data (odd address)
No
No
Yes
Yes
Yes
Yes
EWAIT
I
—
—
External control for external bus access
stretches (adding wait states)
No
No
Yes
No
Yes
No



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