参数资料
型号: T89C51AC2-SLSIM
厂商: Atmel
文件页数: 98/121页
文件大小: 0K
描述: IC 8051 MCU FLASH 32K 44PLCC
标准包装: 27
系列: 89C
核心处理器: 8051
芯体尺寸: 8-位
速度: 40MHz
连通性: UART/USART
外围设备: POR,PWM,WDT
输入/输出数: 34
程序存储器容量: 32KB(32K x 8)
程序存储器类型: 闪存
EEPROM 大小: 2K x 8
RAM 容量: 1.25K x 8
电压 - 电源 (Vcc/Vdd): 3 V ~ 5.5 V
数据转换器: A/D 8x10b
振荡器型: 外部
工作温度: -40°C ~ 85°C
封装/外壳: 44-LCC(J 形引线)
包装: 管件
78
A/T89C51AC2
4127H–8051–02/08
Figure 41. PCA Capture Mode
16-bit Software Timer
Mode
The PCA modules can be used as software timers by setting both the ECOM and MAT
bits in the modules CCAPMn register. The PCA timer will be compared to the module’s
capture registers and when a match occurs an interrupt will occur if the CCFn (CCON
SFR) and the ECCFn (CCAPMn SFR) bits for the module are both set.
Figure 42. PCA 16-bit Software Timer and High Speed Output Mode
CEXn
n = 0, 4
PCA Counter
CH
(8bits)
CL
(8bits)
CCAPnH CCAPnL
CCFn
CCON
PCA
Interrupt
Request
-
0CAPPn CAPNn
000
ECCFn
7
CCAPMn Register (n = 0, 4)
0
CCAPnL
(8 bits)
CCAPnH
(8 bits)
-
ECOMn0 0 MATn TOGn0 ECCFn
7
0
CCAPMn Register
(n = 0, 4)
CH
(8 bits)
CL
(8 bits)
16-Bit Comparator
Match
Enable
CCFn
CCON reg
PCA
Interrupt
Request
CEXn
Compare/Capture Module
PCA Counter
“0”
“1”
Reset
Write to
CCAPnL
Write to CCAPnH
For software Timer mode, set ECOMn and MATn.
For high speed output mode, set ECOMn, MATn and TOGn.
Toggle
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