参数资料
型号: TS80C51RD2-MCLB
厂商: ATMEL CORP
元件分类: 微控制器/微处理器
英文描述: 8-BIT, 40 MHz, MICROCONTROLLER, PQCC68
封装: PLASTIC, LCC-68
文件页数: 17/74页
文件大小: 689K
代理商: TS80C51RD2-MCLB
24
Rev. C - 06 March, 2001
TS80C51RA2/RD2
TS83C51RB2/RC2/RD2
TS87C51RB2/RC2/RD2
Figure 7. PCA Timer/Counter
Table 8. CMOD: PCA Counter Mode Register
The CMOD SFR includes three additional bits associated with the PCA (See Figure 7 and Table 8).
The CIDL bit which allows the PCA to stop during idle mode.
The WDTE bit which enables or disables the watchdog function on module 4.
CMOD
Address 0D9H
CIDL
WDTE
-
CPS1
CPS0
ECF
Reset value
0
X
0
Symbol
Function
CIDL
Counter Idle control: CIDL = 0 programs the PCA Counter to continue functioning during
idle Mode. CIDL = 1 programs it to be gated off during idle.
WDTE
Watchdog Timer Enable: WDTE = 0 disables Watchdog Timer function on PCA Module 4.
WDTE = 1 enables it.
-
Not implemented, reserved for future use.a
a.
User software should not write 1s to reserved bits. These bits may be used in future 8051 family
products to invoke new features. In that case, the reset or inactive value of the new bit will be 0, and its
active value will be 1. The value read from a reserved bit is indeterminate.
CPS1
PCA Count Pulse Select bit 1.
CPS0
PCA Count Pulse Select bit 0.
CPS1
CPS0
Selected PCA input.b
b.
fosc = oscillator frequency
0
Internal clock fosc/12 (Orfosc/6 in X2 Mode).
0
1
Internal clock fosc/4 ( Or fosc/2 in X2 Mode).
1
0
Timer 0 Overflow
1
External clock at ECI/P1.2 pin (max rate = fosc/8)
ECF
PCA Enable Counter Overflow interrupt: ECF = 1 enables CF bit in CCON to generate an
interrupt. ECF = 0 disables that function of CF.
CIDL
CPS1
CPS0
ECF
It
CH
CL
16 bit up/down counter
To PCA
modules
Fosc /12
Fosc / 4
T0 OVF
P1.2
Idle
CMOD
0xD9
WDTE
CF
CR
CCON
0xD8
CCF4
CCF3
CCF2
CCF1
CCF0
overow
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