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参数资料
| 型号： | MC68HC05RC9P |
| 厂商： | MOTOROLA INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP28 |
| 封装： | PLASTIC, DIP-28 |
| 文件页数： | 87/124页 |
| 文件大小： | 457K |
| 代理商： | MC68HC05RC9P |
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Core Timer
Core Timer Control and Status Register
MC68HC05RC18 — Rev. 2.0
General Release Specification
MOTOROLA
Core Timer
65
NON-DISCLOSURE
AGREEMENT
REQUIRED
8.3 Core Timer Control and Status Register
The CTCSR contains the timer interrupt flag, the timer interrupt enable
bits, and the real-time interrupt rate select bits. Figure 8-2 shows the
value of each bit in the CTCSR when coming out of reset.
CTOF — Core Timer Overflow
CTOF is a read-only status bit set when the 8-bit ripple counter rolls
over from $FF to $00. Clearing the CTOF is done by writing a one to
TOFC. Writing to this bit has no effect. Reset clears CTOF.
RTIF — Real-Time Interrupt Flag
The real-time interrupt circuit consists of a 3-stage divider and a one-
of-four selector. The clock frequency that drives the RTI circuit is E/212
(or E
÷ 4096) with three additional divider stages giving a maximum
interrupt period of 16 milliseconds at a bus rate of 2.024 MHz. RTIF is
a clearable, read-only status bit and is set when the output of the
chosen (one-of-four selection) stage goes active. Clearing the RTIF is
done by writing a one to RTFC. Writing has no effect on this bit. Reset
clears RTIF.
TOFE — Timer Overflow Enable
When this bit is set, a CPU interrupt request is generated when the
CTOF bit is set. Reset clears this bit.
RTIE — Real-Time Interrupt Enable
When this bit is set, a CPU interrupt request is generated when the
RTIF bit is set. Reset clears this bit.
Address:
$0008
Bit 7
654321
Bit 0
Read:
CTOF
RTIF
TOFE
RTIE
00
RT1
RT0
Write:
TOFC
RTFC
Reset:
00000011
= Unimplemented
Figure 8-2. Core Timer Control and Status Register (CTCSR)
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