SM59A16U1
8-Bit Micro-controller
64KB with ISP Flash
& 6K+256B RAM embedded
19.19 USB Endpoint 0 Data Counter Register( EP0CNT )
Mnemonic: EP0CNT
Address: B7h
7
6
5
4
3
2
1
0
Reset
00H
-
EP0CNT[3:0]
EP0CNT[3:0]:
The EP0CNT is automatically incremented by 1 after the endpoint 0 receive FIFO register
(EP0DATA) is written by SIE. The EP0CNT will count to 8H when it reaches the maximum
count. The EP0CNT is automatically decreased by 1 after the MCU to read EP0DATA
register. If EP0CNT = 00h, the Endpoint 0 FIFO is empty.
When endpoint 0 transmit mailbox (EP0DATA) data port is written by MCU, the pointer is
automatically incremented by 1. The EP1CNT will count to 8H when it reaches the
maximum count.
19.20 USB Endpoint 1 Data Counter Register( EP1CNT )
Mnemonic: EP1CNT
Address: A1h
7
6
5
4
3
2
1
0
Reset
-
EP1CNT[3:0]
00H
EP1CNT[3:0]:
This register determines which address of endpoint 1 transmit register is accessed when
the Endpoint 1 transmit mailbox (EP1DATA) data port is written by MCU. This pointer is
automatically incremented by 1 after the endpoint 1 transmit mailbox data port is written by
MCU. The EP1CNT will count to 8H when it reaches the maximum count.
19.21 USB Endpoint 2 Data Counter Register( EP2CNT )
Mnemonic: EP2CNT
Address: A2h
7
6
5
4
3
2
1
0
Reset
00H
-
EP2CNT[3:0]
EP2CNT[3:0]:
The EP2CNT is automatically incremented by 1 after the endpoint 2 receive FIFO register
(EP2DATA) is written by SIE. The EP2CNT will count to 8H when it reaches the maximum
count. The EP2CNT is automatically decreased by 1 after the MCU to read EP2DATA
register. If EP2CNT = 00h, the Endpoint 2 FIFO is empty.
19.22 USB Endpoint 3 Data Counter Register( EP3CNT )
Mnemonic: EP3CNT
Address: A3h
7
-
6
5
4
3
2
1
0
Reset
00H
EP3CNT[6:0]
EP3CNT[6:0]:
Endpoint 3 device write data counter register.
This register determines which address of endpoint 3 transmit register is accessed when
the Endpoint 3 transmit FIFO (EP3DATA) data port is written by MCU. This EP3CNT is
automatically incremented by 1 after the endpoint3 transmit FIFO data port is written by
MCU. The EP3CNT pointer will count to 40H when it reaches the maximum count.
Specifications subject to change without notice contact your sales representatives for the most recent information.
ISSFD-M071 Ver A SM59A16U1 04/12/2013
- 128 -
SYNCMOS [ SYNCMOS TECHNOLOGIES,INC ]
