APPOTECH CW6632B - 11 External Memory Interface (EMI); EMI Control Registers

11 External Memory Interface (EMI) 91
CW6632B Bluetooth 3.0 Audio Player SOC Version 1.0.0
Copyright ©2015, www.appotech.com. All Rights Reserved.
11 External Memory Interface (EMI)
CW6632B provides External Memory Interface (EMI) to accelerate data transfer. Figure 11-1 shows EMI timing.
EMIHTEMIST EMIPW
EMI_DATA(P2)
EMI_WEN(P3.3)
Figure 11-1 EMI timing
11.1 EMI Control Registers
Register 11-1 EMICON0 – EMI control0
Position
7
6
5
4
3
2
1
0
Name
EMIEN
EMIPW
EMIHT
EMIST
Default
1
0
0
0
0
0
0
0
Access
WO
WO
WO
WO
WO
WO
WO
WO
EMIEN:
When writing: EMI Enable
0 = Disable
1 = Enable
EMIPW: EMI pulse width
000 = 1 system clock cycle
001 = 2 system clock cycles
010 = 3 system clock cycles
011 = 4 system clock cycles
100 = 5 system clock cycles
101 = 6 system clock cycles
110 = 7 system clock cycles
111 = 8 system clock cycles
EMIHT: EMI hold time
00 = 1 system clock cycle
01 = 2 system clock cycles