MMC2114 MOTOROLA [Motorola, Inc], MMC2114 Datasheet - Page 151

• Manufacturer Part Number: MMC2114
• Description: M CORE Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

5.7.2.1 Synchronous Reset Requests
5.7.2.2 Internal Reset Request
5.7.2.3 Power-On Reset/Low-Voltage Detect Reset
MMC2114 • MMC2113 • MMC2112 — Rev. 1.0
MOTOROLA
In this discussion, the reference in parentheses refer to the state
numbers in
If either the external RESET pin is asserted by an external device for at
least four rising CLKOUT edges (3), or the watchdog timer times out, or
software requests a reset, the reset control logic latches the reset
request internally and enables the bus monitor (5). When the current bus
cycle is completed (6), RSTOUT is asserted (7). The reset control logic
waits until the RESET pin is negated (8) and for the PLL to attain lock
(9, 9A) before waiting 512 CLKOUT cycles (1).The reset control logic
may latch the configuration according to the RCON pin level (11, 11A)
before negating RSTOUT (12).
If the external RESET pin is asserted by an external device for at least
four rising CLKOUT edges during the 512 count (10) or during the wait
for PLL lock (9A), the reset flow switches to (8) and waits for the RESET
pin to be negated before continuing.
If reset is asserted by an asynchronous internal reset source, such as
loss of clock (1) or loss of lock (2), the reset control logic asserts
RSTOUT (4). The reset control logic waits for the PLL to attain lock
(9, 9A) before waiting 512 CLKOUT cycles (1). Then the reset control
logic may latch the configuration according to the RCON pin level (11,
11A) before negating RSTOUT (12).
If loss of lock occurs during the 512 count (10), the reset flow switches
to (9A) and waits for the PLL to lock before continuing.
When the reset sequence is initiated by power-on reset (0), the same
reset sequence is followed as for the other asynchronous reset sources.
Freescale Semiconductor, Inc.
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Reset Controller Module
5-4. All cycle counts given are approximate.
Reset Controller Module
Functional Description
Advance Information
151