MDT90P01_09 Datasheet, PDF (6/11 Pages) Micon Design Technology Corporation – 4-bit micro-controller

MDT90P01
(5) PORT B : R6
PB3~PB0, I/O Register
(6) TMRL (Time Mode Register Low Nibble) (only write)
Bit
2—0
3
Symbol
PS2—0
PSC
Function
Prescaler Value
RTCC rate
000
001
010
011
100
101
110
111
Prescaler assignment bit :
0 — RTCC
1 — Watchdog Timer
1:2
1:4
1:8
1 : 16
1 : 32
1 : 64
1 : 128
1 : 256
WDT rate
1:1
1:2
1:4
1:8
1 : 16
1 : 32
1 : 64
1 : 128
TMRH (Time Mode Register High Nibble) (only write)
Bit
Symbol
Function
RTCC signal Edge :
0
TCE
0 — Increment on low-to-high transition on RTCC pin
1 — Increment on high-to-low transition on RTCC pin
RTCC signal set :
1
TCS
0 — Internal instruction cycle clock
TD = 1 / Fosc (RTCC rate 1:1 , 1:2, 1:4)
TD = 4 / Fosc (other RTCC rate)
1 — Transition on RTCC pin
TD =~ 1uS , VDD=5v
PortB pull-high :
2
PBPHB 0 — Enable
1 — Disable
PortB wake-up :
3
PBWUB 0 — Enable
1 — Disable
(7) CPIO B (Control Port I/O Mode Register)
The CPIO register is “write-only”
＝“0”, I/O pin in output mode;
＝“1”, I/O pin in input mode.
(8) Configurable options for EPROM (Set by writer) :
Oscillator Type
INTRC 4Mhz
INTRC 8Mhz
This specification is subject to be changed without notice. Please visit our web site for the most updated information.
http://www.mdtic.com.tw
P. 6
2009/6 Ver. 1.1