参数资料
型号: MC68HC705CL16
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 1.802 MHz, MICROCONTROLLER, PQFP100
封装: TQFP-100
文件页数: 111/145页
文件大小: 673K
代理商: MC68HC705CL16
GENERAL RELEASE SPECIFICATION
June 11, 1997
MOTOROLA
TIMER
MC68HC05CL48
8-16
REV 2.0
8.2.1 Computer Operating Properly (COP) Watchdog reset
The COP watchdog timer function is implemented on this device by using the
output of the RTI circuit and further dividing it by eight. The minimum COP reset
rates are listed in Table 8-1. If the COP circuit times out, an internal reset is
generated and the normal reset vector is fetched.
Preventing a COP time-out is done by writing a “0” to bit 0 of address $FFF0. This
location is shared with User ROM byte. And reading this location will return the
User ROM data. When the COP is cleared, only the nal divide by eight stage
(output of the RTI) is cleared. If the COP (Computer Operating Properly)
Watchdog Timer circuit times out, an internal reset is generated and the reset
vector is fetched.
This function is software selectable by setting the COP bit in the Option Register.
The COP bit is set after reset, i.e. the COP function is defaulted. The COP
function can be disable by writing a ‘0’ to this bit.
NOTE
COP is located at bit 6 of the Option Register at $001F, which can
only be written once after reset.
8.2.2 Ctimer Control and Status Register (CTCSR)
The CTCSR contains the timer interrupt ag, the timer interrupt enable bits, and
the real time interrupt rate select bits.
CTOF - Core Timer Over Flow
This is a clearable, read-only status bit and is set when the 8-bit ripple counter
rolls over from $FF to $00.
1 =
No effect
0 =
Clearing the TOF
RTIF - Real Time Interrupt Flag
The Real Time Interrupt circuit consists of a three stage divider and a 1 of 4
selector. The clock frequency that drives the RTI circuit is E/213 with three
additional divider stages. This ag is a clearable, read-only status bit and is set
76543210
CTCSR
$0008
READ
CTOF
RTIF
CTOFE
RTIE
00
RT1
RT0
WRITE
RESET
00000011
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