W921E400A Datasheet, PDF (32/53 Pages) Winbond – 4-BIT MICROCONTROLLER

W921E400A/W921C400
The hold mode can be released only by the RESET pin or the interrupt request signal. Before the
device enters the hold mode, the hold mode release flag1, 2, 3 (HMRF1, 2, 3, address = 036H, 037H,
038H) must be set to define the hold mode release conditions. If interrupt condition is met and
enabled in hold mode, the interrupt will be accepted to release hold mode and jump to interrupt vector
to execute interrupt service routine. For more details, refer to the following flags and flow chart.
HMRF1 register: (address = 036H, default data = 0H)
b3
b2
b1
b0
Reserved
0: TM0 hold released disable
1: TM0 hold released enable
0: TM2 hold released disable
1: TM2 hold released enable
0: TM3 hold released disable
1: TM3 hold released enable
HMRF2 register: (address = 037H, default data = 0H)
b3
b2
b1
b0
Reserved
0: INT0 pin hold released disable
1: INT0 pin hold released enable
0: Serial port hold released disable
1: Serial port hold released enable
0: Comparator hold released disable
1: Comparator hold released enable
HMRF3 register: (address = 038H, default data = 0H)
b3
b2
b1
b0
Reserved
Reserved
Reserved
0: Pin P4.2 hold released disable
1: Pin P4.2 hold released enable
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