参数资料
型号: MC68HC08AS20CFN
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, MICROCONTROLLER, PQCC52
封装: PLASTIC, LCC-52
文件页数: 61/96页
文件大小: 3243K
代理商: MC68HC08AS20CFN
7
MOTOROLA
7-4
MC68HC05E0
TIMERS
7.4
Control Registers for Timer A and Timer B
Timer A and Timer B are enabled/disabled via the CETA (Count Enable Timer A) and CETB (Count
Enable Timer B) control bits in the Timer Control Register ($000C).
CETA, CETB
1 (set)
Counter enabled
0 (clear) –
Counter disabled
Both timers generate a signal on overow which can be used to interrupt the processor. These
signals can be masked by the INTMA and INTMB bits in the Interrupt Control Register ($000E).
Timer Interrupt Flag and Acknowledge bits INTFA and INTFB indicate when a timer interrupt has
occurred and can be written to reset the timer interrupt logic.
INTMA, INTMB
1 (set)
Interrupts not masked
0 (clear) –
Interrupts masked
INTFA, INTF
1 (set)
Interrupt has occurred
0 (clear) –
Interrupt has not occurred
Writing a “0” to INTFA or INTFB acknowledges the interrupt and resets the interrupt signal for that
timer.
Address
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
State
on reset
Timer control register
$000C
SC1
SC0
PITX
PITW
1
XROM CETB
CETA 0000 1100
Address
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
State
on reset
Interrupt control register
$000C
WAKF INTXP INTFB INTFA INTFX INTMB INTMA INTMX 0000 0001
64
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