s3c72m9 Samsung Semiconductor, Inc., s3c72m9 Datasheet - Page 306

• Manufacturer Part Number: s3c72m9
• Description: The S3c72m5/s3c72m7/s3c72m9 Single-chip Cmos Microcontroller Has Been Designed For High Performance Using Samsung S
• Manufacturer: Samsung Semiconductor, Inc.

TIMERS and TIMER/COUNTERS
WATCH TIMER MODE REGISTER (WMOD)
The watch timer mode register WMOD is used to select specific watch timer operations. It is 8-bit write-only
addressable. An exception is WMOD bit 3 (the XT
RESET automatically sets WMOD.3 to the current input level of the subsystem clock, XT
logic zero), and all other WMOD bits to logic zero.
In summary, WMOD settings control the following watch timer functions:
— Watch timer clock selection
— Watch timer speed control
— Enable/disable watch timer
— XT
— Buzzer frequency selection
— Enable/disable buzzer output
NOTE:
11-58
WMOD.5–.4
Bit Name
F88H
F89H
WMOD.7
WMOD.6
WMOD.3
WMOD.2
WMOD.1
WMOD.0
IN
Main system clock frequency (fx) is assumed to be 4.19 MHz; subsystem clock (fxt) is assumed to be 32.768 kHz.
input level control
WMOD.3
WMOD.7
0
0
1
1
Values
Table 11-19. Watch Timer Mode Register (WMOD) Organization
0
1
0
0
1
0
1
0
1
0
1
0
1
0
1
WMOD.2
"0"
Disable buzzer (BUZ) signal output
Enable buzzer (BUZ) signal output
Always logic zero
2 kHz buzzer (BUZ) signal output
4 kHz buzzer (BUZ) signal output
8 kHz buzzer (BUZ) signal output
16 kHz buzzer (BUZ) signal output
Input level to XT
Input level to XT
Disable watch timer; clear frequency dividing circuits
Enable watch timer
Normal mode; sets IRQW to 0.5 seconds
High-speed mode; sets IRQW to 3.91 ms
Select (fx/128 ) as the watch timer clock (fw)
Select subsystem clock as watch timer clock (fw)
(WMOD.0)
(WMOD.1)
(WMOD.2)
(WMOD.3)
(WMOD.4 and WMOD.5)
(WMOD.7)
WMOD.1
WMOD.5
IN
IN
IN
pin is low
pin is high
input level control bit) which is 1-bit read-only addressable. A
WMOD.0
WMOD.4
Function
S3C72M5/C72M7/C72M9/P72M9 (Preliminary Spec)
IN
(high, if logic one; low, if
Address
F89H
F88H