MDT1020 Datasheet, PDF (5/18 Pages) Micon Design Technology Corporation – 8-bit micro-controller

(5) MSR (Memory Select Register) : R4
Memory Select Register :
00 : 10~1F
01 : 30~3F
10 : 50~5F
11 : 70~7F
MDT1020
b7
b6
b5
b4
b3
b2
b1
b0
Read only “1”
Indirect Addressing Mode
(6) PORT A : R5
PA3~PA0, I/O Register
(7) PORT B : R6
PB7~PB0, I/O Register
(8) PORT C : R7
PC7~PC0, I/O Register
(9) TMR (Time Mode Register)
Bit Symbol
Function
Prescaler Value
RTCC rate
WDT rate
20
3
4
5
PS2 0
PSC
TCE
TCS
000
1:2
1:1
001
1:4
1:2
010
1:8
1:4
011
1 : 16
1:8
100
1 : 32
1 : 16
101
1 : 64
1 : 32
110
1 : 128
1 : 64
111
1 : 256
Prescaler assignment bit :
0 RTCC
1 : 128
1 Watchdog Timer
RTCC signal Edge :
0 Increment on low-to-high transition on RTCC pin
1 Increment on high-to-low transition on RTCC pin
RTCC signal set :
0 Internal instruction cycle clock
1 Transition on RTCC pin
(10) CPIO A, CPIO B, CPIO C (Control Port I/O Mode Register)
This specification are subject to be changed without notice. Any latest information please preview
http;//www.mdtic.com.tw
P.5
2005/6 Ver1.4