MG87FE/L2051/4051/6051
Preliminary, v 1.03
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Bit 7: OSCDR, OSC Driving control Register. Default value is load from OR1.b4 inverted value. And it could be
read/written by CPU.
0: The driving of crystal oscillator is enough for oscillation up to 48MHz.
1: The driving of crystal oscillator is reduced. It will helpful in EMI reduction. Regarding application not needing
high frequency clock, it is recommended to do so.
Bit 6: EN6TR, Enable 6T mode control register. Default value is load from OR1.b0 inverted value. And it could be
read/written by CPU. The access on this bit will affect CKCON3.EN6TR to corresponding operation and
get same control function.
0: MG87FE/L2051/4051/6051 will run in 12T mode.
1: MG87FE/L2051/4051/6051 will run in 6T mode.
Bit 5~0: This is set the crystal frequency value to define the time base of ISP/IAP programming. Fill with a proper
value according to OSCin, as listed below.
[XCKS5~XCKS0] = OSCin – 1, where OSCin=1~48 (MHz) in 12T mode.
[XCKS5~XCKS0] = OSCinX2 – 1, where OSCin=0.5~24 (MHz) in 6T mode.
For a 12T examples,
(1) If OSCin=12MHz, then fill [XCKS4~XCKS0] with 11, i.e., 001011B.
(2) If OSCin=6MHz, then fill [XCKS4~XCKS0] with 5, i.e., 000101B.
OSCin @ 12T
1MHz
OSCin @ 6T
0.5MHz
1MHz
XCKS Setting
6’b000000
6’b000001
6’b000010
6’b000011
……
2MHz
3MHz
4MHz
……
1.5MHz
2MHz
……
45MHz
46MHz
47MHz
48MHz
22.5MHz
23MHz
23.5MHz
24MHz
6’b101100
6’b101101
6’b101110
6’b101111
The default value of XCKS= 6’b001010 for OSCin= 11MHz at 12T mode.
CKCON3: Clock Control Register 3
Address=8FH, read/write, por+RESET=xxxx-xx0x
7
-
6
-
5
-
4
-
3
-
2
-
1
0
PWDEX
EN6TR
Bit 7~2: Reserved.
Bit 1: PWDEX, Power-down Exit Mode.
0: wake up from Power-down is internally timed.
1: wake up from Power-down is externally controlled.
Bit 0: EN6TR, Enable 6T mode control register. Default value is load from OR1.b0 inverted value. And it could be
read/written by CPU. The access on this bit will affect CKCON2.EN6TR to corresponding operation and
get same control function.
0: MG87FE/L2051/4051/6051 will run in 12T mode.
1: MG87FE/L2051/4051/6051 will run in 6T mode.
This document information is the intellectual property of Megawin Technology.
© Megawin Technology Co., Ltd. 2009 All rights reserved.
QP-7300-03D
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