參數(shù)資料
型號(hào)： HPC-DEV-ISE2
廠商： National Semiconductor Corporation
英文描述： High-Performance Communications MicroController
中文描述： 高性能通信微控制器
文件頁數(shù)： 21/30頁
文件大?。?/td> 362K
代理商： HPC-DEV-ISE2
Memory
The HPC46400E has been designed to offer flexibility in
memory usage. A total address space of 64 kbytes can be
addressed with 256 bytes of RAM available on the chip it-
self.
Program memory addressing is accomplished by the 16-bit
program counter on a byte basis. Memory can be addressed
directly by instructions or indirectly through the B, X and SP
registers. Memory can be addressed as words or bytes.
Words are always accessed on even-byte boundaries. The
HPC46400E uses memory-mapped organization to support
registers, I/O and on-chip peripheral functions.
The HPC46400E memory address space extends to 64
kbytes and registers and I/O are mapped as shown in Table
II.
Extended Memory Addressing
If more than 64k of addressing is desired in a HPC46400E
system, on board bank select circuitry is available that al-
lows four I/O lines of Port B (B8, B9, B13, B14) to be used
in extending the address range. This gives the user a main
routine area of 32k and 16 banks of 32k each for subroutine
and data, thus getting a total of 536.5k of memory.
Note:
If all four lines are not needed for memory expansion, the unused
lines can be used as general purpose inputs.
The Extended Memory Addressing mode is entered by set-
ting the EMA control bit in the Message Control Register. If
this bit is not set, the port B lines (B8, B9, B13, B14) are
available as general purpose I/O or synchronous outputs as
selected by the BFUN register.
The main memory area contains the interrupt vectors &
service routines, stack memory, and common memory for
the bank subroutines to use. The 16 banks of memory can
contain program or data memory (note: since the on chip
resources are mapped into addresses 0000-01FF, the first
512 bytes of each bank are not usable, actual available
memory is 536.5k).
TABLE II. Memory Map
FFFF–FFF0
FFEF–FFD0
Interrupt Vectors
JSRP Vectors
FFCF–FFCE
:
0201–0200
:
External Expansion
USER MEMORY
01FF–01FE
:
01C1–01C0
:
On Chip RAM
USER RAM
01BC
01BA
01B8
01B6
01B4
01B2
01B0
CRC Byte 2
CRC Byte 1
Error Status
Receiver Status
Cntrl
Recr Addr Comp Reg 2
Recr Addr Comp Reg 1
HDLC
Y
2
01AC
01AA
01A8
01A6
01A4
01A2
01A0
CRC Byte 2
CRC Byte 1
Error Status
Receiver Status
Cntrl
Recr Addr Comp Reg 2
Recr Addr Comp Reg 1
HDLC
Y
1
0195–0194
WATCHDOG Register
WATCHDOG Logic
0193–0192
0191–0190
018F–018E
018D–018C
018B–018A
0189–0188
0187–0186
0185–0184
0183–0182
0181–0180
T0CON Register
TMMODE Register
DIVBY Register
T3 Timer
R3 Register
T2 Timer
R2 Register
I2CR Register/ R1
I3CR Register/ T1
I4CR Register
Timer Block T0–T3
017F–017E
017D–017C
Baud Counter
Baud Register
UART Timer
0179–0178
0177–0176
0175–0174
0173–0172
0171–0170
Byte Count 2
Field Addr 2
Byte Count 1
Field Addr 1
Xmit Cntrl & Status
DMAT
Y
2 (Xmit)
016B–016A
0169–0168
0167–0166
0165–0164
0163–0162
0161–0160
Frame Length
Data Addr 2
Cntrl Addr 2
Data Addr 1
Cntrl Addr 1
Recv Cntrl & Status
DMAR
Y
2 (Recv)
0159–0158
0157–0156
0155–0154
0153–0152
0151–0150
Y
Bytes 2
Field Addr 2
Y
Bytes 1
Field Addr 1
Xmit Cntrl & Status
DMAT
Y
1 (Xmit)
014B–014A
0149–0148
0147–0146
0145–0144
0143–0142
0141–0140
Frame Length
Data Addr 2
Cntrl Addr 2
Data Addr 1
Cntrl Addr 1
Recv Cntrl & Status
DMAR
Y
1 (Recv)
012C
012A
0128
0126
0124
0122
0120
Baud
PSR - Prescaler
ENUR Register
TBUF Register
RBUF Register
ENUI Register
ENU Register
UART
0110
010E
010C
010A
0108
0106
FEXT Register
Port R Pins
DIR R Register
Port R Data Register
Message System Configuration
Serial Decoder/Enable
Configuration Reg
Message Pending
Message System Control
Port D Input
PORTS R & D
0104
0102
0100
00F5–00F4
00F3–00F2
00E6
00E3–00E2
BFUN Register
DIR B Register
Chip Revision Register
Port B
PORT B
00DD–00DC
00D8
00D6
00D4
00D2
00D0
Halt Enable Register
Port I Input Register
SIO Register
IRCD Register
IRPD Register
ENIR Register
PORT CONTROL
& INTERRUPT
CONTROL
REGISTERS
00CF–00CE
00CD–00CC
00CB–00CA
00C9–00C8
00C7–00C6
00C5–00C4
00C3–00C2
00C0
X Register
B Register
K Register
A Register
PC Register
SP Register
(Reserved)
PSW Register
HPC CORE
REGISTERS
00BF–00BE
:
0001–0000
On Chip
RAM
:
USER RAM
Note:
All unused addresses are reserved by National Semiconductor
21
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