HD64F2623FA20J Renesas Electronics America, HD64F2623FA20J Datasheet - Page 576

• Manufacturer Part Number: HD64F2623FA20J
• Description: IC H8S MCU FLASH 256K 100-QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2600r

Specifications of HD64F2623FA20J

• Core Processor: H8S/2600
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: CAN, SCI, SmartCard
• Peripherals: POR, PWM, WDT
• Number Of I /o: 53
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 12K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 16x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 100-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

Section 15 Controller Area Network (HCAN)
15.2.16 Unread Message Status Register (UMSR)
The unread message status register (UMSR) is a 16-bit readable/writable register containing status
flags that indicate, for individual mailboxes (buffers), that a received message has been
overwritten by a new receive message before being read. When a message is overwritten by a new
receive message, the old data is lost.
Note:
Bits 15 to 0—Unread Message Status Flags (UMSR7 to UMSR0, UMSR15 to UMSR8):
Status flags indicating that an unread receive message has been overwritten.
Bit x
UMSRx
0
1
Rev. 5.00 Jan 10, 2006 page 550 of 1042
REJ09B0275-0500
Initial value:
Initial value:
UMSR
* Can only be written with 1 for flag clearing.
Description
[Clearing condition]
Writing 1
Unread receive message is overwritten by a new message
[Setting condition]
When a new message is received before RXPR is cleared
R/W:
R/W:
Bit:
Bit:
UMSR15 UMSR14 UMSR13 UMSR12 UMSR11 UMSR10
UMSR7
R/(W) *
R/(W) *
15
0
7
0
UMSR6
R/(W) *
R/(W) *
14
0
6
0
UMSR5
R/(W) *
R/(W) *
13
0
5
0
UMSR4
R/(W) *
R/(W) *
12
0
4
0
UMSR3
R/(W) *
R/(W) *
11
0
3
0
UMSR2
R/(W) *
R/(W) *
10
0
2
0
UMSR1
R/(W) *
UMSR9
R/(W) *
9
0
1
0
(Initial value)
x = 0 to 15
UMSR0
R/(W) *
UMSR8
R/(W) *
8
0
0
0