SPMCK16Z4MPV20 datasheet(380/500 Pages) FREESCALE

380 / 500 page

M68HC16 Z SERIES

D-6

USER’S MANUAL

D.2.1 SIM Module Configuration Register

SIMCR controls system configuration. SIMCR can be read or written at any time, ex-

cept for the module mapping (MM) bit, which can only be written once after reset, and

the reserved bit, which is read-only. Write has no effect.

EXOFF — External Clock Off

0 = The CLKOUT pin is driven during normal operation.

1 = The CLKOUT pin is placed in a high-impedance state.

FRZSW — Freeze Software Enable

0 = When FREEZE is asserted, the software watchdog and periodic interrupt timer

continue to operate, allowing interrupts during background debug mode.

1 = When FREEZE is asserted, the software watchdog and periodic interrupt timer

are disabled, preventing interrupts during 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.

SHEN[1:0] — Show Cycle Enable

The SHEN field determines how the external bus is driven during internal transfer op-

erations. A show cycle allows internal transfers to be monitored externally.

Table D-3 indicates whether show cycle data is driven externally, and whether exter-

nal bus arbitration can occur. To prevent bus conflict, external devices must not be se-

lected during show cycles.

SUPV — Supervisor/User Data Space

This bit has no effect because the CPU16 always operates in the supervisor mode.

SIMCR — SIM Module Configuration Register

$YFFA00

EXOFF

FRZSW FRZBM

RSVD1

NOTES:

1. This bit must be left at zero. Pulling DATA11 high during reset ensures this bit remains zero. A one in this bit could

allow the MCU to enter an unsupported operating mode.

SHEN[1:0]

SUPV

IARB[3:0]

RESET:

DATA11

Table D-3 Show Cycle Enable Bits

SHEN[1:0]

Action

Show cycles disabled, external arbitration enabled

Show cycles enabled, external arbitration disabled

Show cycles enabled, external arbitration enabled

Show cycles enabled, external arbitration enabled;

internal activity is halted by a bus grant

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

SPMCK16Z4MPV20 Datasheet(PDF) 380 Page - Freescale Semiconductor, Inc

SPMCK16Z4MPV20 Datasheet(HTML) 380 Page - Freescale Semiconductor, Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL