C8051F587-IMR Silicon Labs, C8051F587-IMR Datasheet - Page 161
C8051F587-IMR
Manufacturer Part Number
C8051F587-IMR
Description
8-bit Microcontrollers - MCU 50 MIPS 96 kB 8 kB SPI 2xUART
Manufacturer
Silicon Labs
Datasheet
1.C8051F585-IQR.pdf
(356 pages)
Specifications of C8051F587-IMR
Rohs
yes
Core
8051
Data Bus Width
8 bit
Processor Series
C8051
- Current page: 161 of 356
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SFR Definition 18.2. EMI0CF: External Memory Configuration
SFR Address = 0xB2; SFR Page = 0x0F
Name
Reset
Bit
7:5
3:2
1:0
Type
4
Bit
EALE[1:0] ALE Pulse-Width Select Bits.
EMD[1:0]
Unused
Name
EMD2
7
0
Read = 000b; Write = Don’t Care.
EMIF Multiplex Mode Select Bit.
0: EMIF operates in multiplexed address/data mode
1: EMIF operates in non-multiplexed mode (separate address and data pins)
EMIF Operating Mode Select Bits.
00: Internal Only: MOVX accesses on-chip XRAM only. All effective addresses alias to
on-chip memory space
01: Split Mode without Bank Select: Accesses below the 8 kB boundary are directed
on-chip. Accesses above the 8 kB boundary are directed off-chip. 8-bit off-chip MOVX
operations use current contents of the Address high port latches to resolve the upper
address byte. To access off chip space, EMI0CN must be set to a page that is not con-
tained in the on-chip address space.
10: Split Mode with Bank Select: Accesses below the 8 kB boundary are directed on-
chip. Accesses above the 8 kB boundary are directed off-chip. 8-bit off-chip MOVX
operations uses the contents of EMI0CN to determine the high-byte of the address.
11: External Only: MOVX accesses off-chip XRAM only. On-chip XRAM is not visible to
the CPU.
These bits only have an effect when EMD2 = 0.
00: ALE high and ALE low pulse width = 1 SYSCLK cycle.
01: ALE high and ALE low pulse width = 2 SYSCLK cycles.
10: ALE high and ALE low pulse width = 3 SYSCLK cycles.
11: ALE high and ALE low pulse width = 4 SYSCLK cycles.
6
0
5
0
EMD2
Rev. 1.2
4
0
R/W
Function
3
0
EMD[1:0]
C8051F58x/F59x
2
0
1
1
EALE[1:0]
0
1
161
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