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| 型號(hào)： | MC16S2CPU20B1 |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16-BIT, 20.97 MHz, MICROCONTROLLER, PQFP100 |
| 封裝： | TQFP-100 |
| 文件頁(yè)數(shù)： | 10/104頁(yè) |
| 文件大小： | 812K |
| 代理商： | MC16S2CPU20B1 |
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MC68HC16S2
MOTOROLA
MC68HC16S2TS/D
13
FRZSW — Freeze Software Enable
0 = When FREEZE is asserted, the software watchdog and periodic interrupt timer counters con-
tinue to run.
1 = When FREEZE is asserted, the software watchdog and periodic interrupt timer counters are dis-
abled, preventing interrupts while the MCU is in background debug mode.
FRZBM — Freeze Bus Monitor Enable
0 = When FREEZE is asserted, the bus monitor continues to operate.
1 = When FREEZE is asserted, the bus monitor is disabled.
SLVEN — Factory Test Mode Enabled
This bit is a read-only status bit that reflects the state of DATA11 during reset.
0 = IMB is not available to an external master.
1 = An external bus master has direct access to the IMB.
SHEN[1:0] — Show Cycle Enable
This field determines what the EBI does with the external bus during internal transfer operations. A
show cycle allows internal transfers to be externally monitored. Table 8 shows whether show cycle data
is driven externally, and whether external bus arbitration can occur. To prevent bus conflict, external
peripherals must not be enabled during show cycles.
SUPV — Supervisor/Unrestricted Data Space
This bit has no effect because the CPU16 always operates in the supervisor mode.
MM — Module Mapping
0 = Internal modules are addressed from $7FF000 – $7FFFFF.
1 = Internal modules are addressed from $FFF000 – $FFFFFF.
The logic state of MM determines the value of ADDR23 for IMB module addresses. Because
ADDR[23:20] are driven to the same state as ADDR19, MM must be set to one. If MM is cleared, IMB
modules are inaccessible. This bit can be written only once after reset.
IARB[3:0] — Interrupt Arbitration Field
Each module that can generate interrupt requests has an interrupt arbitration (IARB) field. Arbitration
between interrupt requests of the same priority is performed by serial contention between IARB field bit
values. Contention must take place whenever an interrupt request is acknowledged, even when there
is only a single pending request. An IARB field must have a non-zero value for contention to take place.
If an interrupt request from a module with an IARB field value of %0000 is recognized, the CPU pro-
cesses a spurious interrupt exception. Because the SIM routes external interrupt requests to the CPU,
the SIM IARB field value is used for arbitration between internal and external interrupts of the same pri-
ority. The reset value of IARB for the SIM is %1111, and the reset value of IARB for all other modules
is %0000, which prevents SIM interrupts from being discarded during initialization.
Table 8 Show Cycle Enable Bits
SHEN[1:0]
Action
00
Show cycles disabled, external bus arbitration allowed
01
Show cycles enabled, external bus arbitration not allowed
10
Show cycles enabled, external bus arbitration allowed
11
Show cycles enabled, external bus arbitration allowed,
internal activity is halted by a bus grant
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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