参数资料
型号: S3P9664-SM
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 6 MHz, MICROCONTROLLER, PDSO24
封装: 0.300 INCH, SOP-24
文件页数: 134/148页
文件大小: 784K
代理商: S3P9664-SM
BASIC TIMER and TIMER 0
S3C9664/P9664 (Preliminary Spec)
10-2
BASIC TIMER CONTROL REGISTER (BTCON)
The basic timer control register, BTCON, is used to select the input clock frequency, to clear the basic timer
counter and frequency dividers, and to enable or disable the watchdog timer function. It is located in set 1,
address D3H, and is read/write addressable using Register addressing mode.
A reset clears BTCON to "00H". This enables the watchdog function and selects a basic timer clock frequency of
f
OSC/4096. To disable the watchdog function, you must write the signature code "1010B" to the basic timer
register control bits BTCON.7–BTCON.4.
The 8-bit basic timer counter, BTCNT, can be cleared at any time during the normal operation by writing a "1" to
BTCON.1. To clear the frequency dividers for both the basic timer input clock and the timer 0 clock, you write a
"1" to BTCON.0.
Basic Timer Control Register (BTCON)
D3H, Set 1, R/W
.7
.6
.5
.4
.3
.2
.1
.0
MSB
LSB
Divider clear bit for BT and T0:
0 = No effect
1 = Clear both dividers
Basic timer counter clear bits:
0 = No effect
1 = Clear BTCNT
Watchdog timer enable bits:
1010B = Disable watchdog function
Others = Enable watchdog function
Basic timer input clock selection bits:
00 = fOSC/4096
01 = fOSC/1024
10 = fOSC/128
11 = Invalid selection
Figure 10-1. Basic Timer Control Register (BTCON)
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