参数资料
型号: KSZ8864RMN
厂商: Micrel Inc
文件页数: 55/111页
文件大小: 0K
描述: IC ETHERNET SW 4PORT 64QFN
标准包装: 348
控制器类型: 以太网开关控制器
接口: MII,RMII
电源电压: 1.8V,2.5V,3.3V
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 64-VFQFN 裸露焊盘
供应商设备封装: 64-QFN(8x8)
包装: 托盘
配用: 576-3869-ND - BOARD EVALUATION FOR KSZ8864RMN
其它名称: 576-3787
KSZ8864RMN-ND
PIC16C9XX
DS30444E - page 48
1997 Microchip Technology Inc.
7.3
Prescaler
An 8-bit counter is available as a prescaler for the
Timer0 module, or as a postscaler for the Watchdog
Timer (Figure 7-6). For simplicity, this counter is being
referred to as “prescaler” throughout this data sheet.
Note that the prescaler may be used by either the
Timer0 module or the WDT but not both. Thus, a pres-
caler assignment for the Timer0 module means that
there is no prescaler for the Watchdog Timer, and
vice-versa.
The PSA and PS2:PS0 bits (OPTION<3:0>) determine
the prescaler assignment and prescale ratio.
When assigned to the Timer0 module, all instructions
writing to the TMR0 register (e.g. CLRF 1, MOVWF 1,
BSF
1,x
....etc.) will clear the prescaler count. When
assigned to WDT, a CLRWDT instruction will clear the
prescaler count along with the Watchdog Timer. The
prescaler is not readable or writable.
Note:
Writing to TMR0 when the prescaler is
assigned to Timer0 will clear the prescaler
count, but will not change the prescaler
assignment.
FIGURE 7-6:
BLOCK DIAGRAM OF THE TIMER0/WDT PRESCALER
RA4/T0CKI
T0SE
pin
M
U
X
CLKOUT (=Fosc/4)
SYNC
2
Cycles
TMR0 reg
8-bit Prescaler
8 - to - 1MUX
M
U
X
M U X
Watchdog
Timer
PSA
0
1
0
1
WDT
Time-out
PS2:PS0
8
Note: T0CS, T0SE, PSA, PS2:PS0 are (OPTION<5:0>).
PSA
WDT Enable bit
M
U
X
0
1
0
1
Data Bus
Set ag bit T0IF
on Overow
8
PSA
T0CS
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