MC68HC711PH8 Motorola, MC68HC711PH8 Datasheet - Page 136

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MC68HC711PH8

Manufacturer Part Number
MC68HC711PH8
Description
High-density Complementary Metal Oxide Semiconductor (HCMOS) Microcomputer Unit
Manufacturer
Motorola
Datasheet
8
The real-time interrupt (RTI) is a programmable periodic interrupt circuit that permits pacing of the
execution of software routines by selecting one of four interrupt rates. It may be clocked by the
16-bit timer (ST4XCK/2
whether or not the PLL system is active (see Figure 8-1, Figure 8-2 and Section 8.1.5).
The COP watchdog clock input may be tapped off from the free-running counter chain
(ST4XCK/2
whether or not the PLL system is active (see Figure 8-1, Figure 8-2 and Section 8.1.6). The COP
automatically times out unless it is serviced within a specific time by a program reset sequence. If
the COP is allowed to time out, a reset is generated, which drives the RESET pin low to reset the
MCU and the external system (see Section 10).
The LCD module can drive up to four LCD segments, and may be clocked by the 16-bit timer
(ST4XCK/2
whether or not the PLL system is active (see Figure 8-1, Figure 8-2 and Section 2).
MOTOROLA
8-2
18
17
), or by the underflow of the 8-bit modulus timer A (CLK64 or CLK64/8), depending on
(1) Crystal frequencies are valid only if the PLL is not active.
), or may be the underflow of the 8-bit modulus timer A (CLK64/4), depending on
Control bits
PR[1:0]
0 0
0 1
1 0
1 1
15
65.536ms
262.14ms
524.29ms
1049 ms
4.0MHz
1.0MHz
1000ns
16.0 s
) or by the underflow of 8-bit modulus timer A (CLK64), depending on
1.0 s
4.0 s
8.0 s
Table 8-1 Timer resolution and capacity
32.768ms
131.07ms
262.14ms
524.29ms
8.0MHz
2.0MHz
500ns
500ns
2.0 s
4.0 s
8.0 s
TIMING SYSTEM
21.845ms
87.381ms
174.76ms
349.53ms
12.0MHz
1.333 s
2.667 s
5.333 s
3.0MHz
333ns
333ns
Clock
16.384ms
65.536ms
131.07ms
262.14ms
16.0MHz
4.0MHz
250ns
250ns
1.0 s
2.0 s
4.0 s
2
2
2
2
16/ST4XCK
32/ST4XCK
64/ST4XCK
ST4XCK/4
4/ST4XCK
4/ST4XCK
18
20
21
22
ST4XCK
/ST4XCK
/ST4XCK
/ST4XCK
/ST4XCK
Ð resolution
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Ð resolution
Ð overßow
Ð resolution
Ð overßow
Ð resolution
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Crystal
Period
Clock
(1)
MC68HC11PH8
TPG

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