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| 型号： | MC68CK338CPV14B1 |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, 14.4 MHz, MICROCONTROLLER, PQFP144 |
| 封装： | PLASTIC, TQFP-144 |
| 文件页数： | 125/133页 |
| 文件大小： | 944K |
| 代理商： | MC68CK338CPV14B1 |
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MC68CK338
MOTOROLA
MC68CK338TS/D
91
6.8.1 MCSM Registers
The MCSM contains a status/interrupt/control register, a counter, and a modulus latch. All unused bits
and reserved address locations return zero when read. Writing to unused bits and reserved address
locations has no effect. The CTM6 contains three MCSMs, each with its own set of registers.
COF — Counter Overflow Flag
This status flag indicates whether or not a counter overflow has occurred. An overflow of the MCSM
counter is defined to be the transition of the counter from $FFFF to $xxxx, where $xxxx is the value con-
tained in the modulus latch. If the IL[2:0] field is non-zero, an interrupt request is generated when the
COF bit is set.
0 = Counter overflow has not occurred
1 = Counter overflow has occurred
This flag is set only by hardware and cleared only by software or by a system reset. To clear the flag,
the software must first read the register with COF set to one, then write a zero to the bit. COF is cleared
only if no overflow occurs between the read and write operations.
IL[2:0] — Interrupt Level
Setting IL[2:0] to a non-zero value causes the MCSM to request an interrupt of the selected level when
the COF bit sets. If IL[2:0] = %000, no interrupt will be requested when COF sets. These bits can be
read or written at any time and are cleared by reset.
IARB3 — Interrupt Arbitration Bit 3
This bit works in conjunction with IARB[2:0] in the BIUMCR. Each module that generates interrupt re-
quests on the IMB must have a unique value in the arbitration field. This interrupt arbitration identifica-
tion number is used to arbitrate for the IMB when modules generate simultaneous interrupts of the same
priority. The IARB3 bit is cleared by reset. Refer to 6.4.1 BIUSM Registers for more information on
IARB[2:0].
DRV[A:B] — Drive Time Base Bus
This bit field contains read/write bits that control the connection of the MCSM to time base buses A and
B. These bits are cleared by reset. Refer to Table 52.
WARNING
Two time base buses should not be driven at the same time.
MCSM2SIC — MCSM2 Status/Interrupt/Control Register
$YFF410
MCSM30SIC — MCSM30 Status/Interrupt/Control Register
$YFF4F0
MCSM31SIC — MCSM31 Status/Interrupt/Control Register
$YFF4F8
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
COF
IL[2:0]
IARB3
0
DRVA
DRVB
IN2
IN1
EDGEN EDGEP
0
CLK[2:0]
RESET:
0
Table 52 Drive Time Base Bus Field
DRVA
DRVB
Bus Selected
0
No time base bus is driven
0
1
Time base bus B is driven
1
0
Time base bus A is driven
1
Both time base buses A and B are driven
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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